How to configure internal bgp. These two methods, which also apply to external BGP peers, are as follows: Peer the routers using the physical interface IP addresses How to Configure Internal BGP Features. In the configuration of R1 above the only difference is the AS number for each neighbor. This scenario shows how to achieve load sharing when there are multiple (up to a maximum of six), equal-cost links. internal peers prefixes learned from other iBGP peers. Although the hardware on your end may be different, the BGP is an RFC standard, and I am using a Cisco router to set it up remotely, in the end, everything will still work as it should, irrespective of the hardware and BGP protocol supported. 2 remote-as 2. It manages how packets get routed from network to network by exchanging routing and reachability information among edge routers. To configure the device as a node in a BGP network: Configure network interfaces. At global configuration mode we enter the configuration for BGP and specify our AS number: R1 (config)#router bgp 65002. Step 3. Unlike IGPs like OSPF or EIGRP, BGP uses a set of attributes to determine the best The router ID can be defined in the co nfig>router>bgp context, using the router-id command, and is only used within BGP. Was planning on a pair of routers that each handle Internet, WAN, and other routing. 1/32 next-hop 192. Multiprotocol BGP allows you to have a unicast routing topology different from a multicast routing topology which helps in control over the network and resources. In this post, I am going to cover a set of BGP configuration scenarios that will provide you with a good understanding of how to configure Border Gateway Protocol on Cisco routers. All the routers in AS are running IBGP with each other. Feb 10, 2017 · Configuring BGP. Set Name to exclude1. BGP routing information includes the complete route to each destination. The default value is 100. Internal BGP (iBGP) refers to running Border Gateway Protocol (BGP) on networking devices within one autonomous system. February 13, 2024. In order to mutually redistribute the eBGP routes in to EIGRP, use the redistribute bgp command with EIGRP metrics. R1(config-router)#network 1. x remote-as command. 3 NEXT_HOP. The multiprotocol BGP(MP-BGP) is an extended BGP that allows BGP to carry routing information for multiple network layer protocols IPv6,VPNv4 and others. This is largely because BGP runs on top of TCP and can make use of TCP flow control. This feature provides improved load balancing deployment and service Jul 2, 2014 · Configures a BGP routing process, and enters router configuration mode for the specified routing process. We recommend that you aggressively dampen unstable IGP peering sessions to reduce the possible impact to BGP. There are two ways to configure iBGP neighbor relationships. The BGP Local Preference attribute or local-pref is used to Feb 15, 2012 · The Internal_fw gateway BGP peer is configured in a manner similar to the External_fw gateway's IBGP configuration. The best-path algorithm also runs if you change the BGP configuration. It selects the ISP which offers the best path Mar 1, 2019 · MBGP is an extension of BGP that can carry routing information for multiple network layer protocols. For more details about internal BGP peers, see the “Configuring Internal BGP Features” chapter of the Cisco IOS IP Routing Configuration Guide. When IGPs have too much route information, they begin to churn. eBGP Peering (external BGP) iBGP Peering (internal BGP) BGP Authentication. Border Gateway Protocol ( BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet. 10. Feb 15, 2016 · The BGP Multipath Load Sharing for both eBGP and iBGP in an MPLS-VPN feature allows you to configure multipath load balancing with both external BGP (eBGP) and internal BGP (iBGP) paths in Border Gateway Protocol (BGP) networks that are configured to use Multiprotocol Label Switching (MPLS) Virtual Private Networks (VPNs). 3 and later, BFD is supported on internal BGP (IBGP) and multihop external BGP (EBGP) sessions as well as on single-hop EBGP sessions. Oct 27, 2014 · FAI_2 (config)#router bgp 2. 0/24) and Inter-area route (10. 2(33)SXI1, and later releases, the Cisco implementation of 4-byte autonomous system numbers uses asplain as the default display format for autonomous system numbers, but you can configure 4-byte autonomous system numbers in both the asplain and asdot format. Secondly, you have to use the bgp confederation identifier command to tell BGP what the main AS number is. 2(33)SRE, 12. What is BGP (Border Gateway Protocol)? BGP (Border Gateway Protocol) is the protocol that enables the global routing system of the internet. Restrictions for Configuring MP-BGP Support for CLNS. 168. I am also advertising a prefix (on a loopback interface) in BGP: R1(config)#interface loopback 0. Navigate to Option 3 (Route Configuration) > Option 1 (Configure Unicast Routing) > Option 3 (Configure BGP). Use the autonomous-system-number argument to specify an integer, from 0 and 65534, that identifies the device to other BGP speakers. Let me show you how you can do this: R1(config)#router eigrp 12. 2, remote AS 45000, internal link BGP version 4, remote router ID 172. OSPF routers build and maintains a global topology database with the exchange of link-state advertisements (LSA). Manually Configuring a BGP Router ID per VRF. Many companies This example shows how to configure internal BGP peer sessions on logical systems. Step 2. set protocols bgp group BGP-Internal local-address 4. BGP is an interdomain routing protocol designed to provide loop-free routing between separate routing domains (autonomous systems) that contain independent routing policies. Each router must have IP routing capability to the remote router's loopback address. [2] BGP is classified as a path-vector routing protocol, [3] and it makes routing decisions based on paths, network policies, or rule-sets configured by a network administrator . Description The link below provides an overview of BGP peering and a sample topology of two autonomous systems (ASs) with a BGP peering session. BGP Timers. Now let’s change this behavior using the weight attribute…. 10/32) through network command. Local Preference can be applied inbound from an external BGP neighbor or outbound to an internal BGP neighbor. Configure the HUB router: Apr 25, 2012 · Configuring External BGP Peering. This option might be more convenient for some routers than configuring the bgp rpki server command, because it saves that router from having to connect to an RPKI server. Specify a list of networks for the BGP routing process. Initialize the address-family with the BGP router configuration command address-family afi safi so it can be associated to a BGP neighbor. Multiple routers usually exist within an AS, so BGP is the only routing protocol in use today that is suited to carry all of the routes in the Internet. FAI_2 (config-router)#exit. Local preference is a well-known and discretionary BGP attribute. As networks interact with each other, they need a way to communicate. Border Gateway Protocol (BGP) is the primary internet routing protocol. We recommend the use of route reflectors to address the issue of a large internal BGP mesh. 5. Set Action to Deny. If not, the router CE2 would Dec 4, 2021 · Open Shortest Path First (OSPF) is a link-state routing protocol that routes IP-only. BGP makes peering possible. You have now learned what the different (BGP) connection options to an ISP are: Single homed: you are connected to a single ISP using a single link. Enables the BGP routing process and places you in the Global Configuration mode. This is how we configure basic EBGP, start with the router bgp “AS number” command to enable the BGP process. Places the router in address family configuration mode for configuring routing sessions such as BGP, RIP, or static routing sessions that use standard VPN Version 4 address prefixes. port1 (ISP1), port2 The fourth BGP attribute is called AS Path: BGP prefers the shortest AS path to get to a destination. In the Rules table, click Create New. May 11, 2020 · Hi Friends,In this video Tutorial i am going to discuss about how to configure Internal Border gateway protocol Subscribe my Channel to get further Updates. See Example: Configuring External BGP Point-to-Point Peer Sessions. When you connect your network to two different Internet service providers (ISPs), it is called multihoming. To change the next hop attribute from 1. With BGP Peer Group. Under Other Rule Variables, enable Match origin and set it to IGP. Let’s simplify the configuration of R1 with our peer group. Configure IBGP sessions between peers. Update the BGP configuration: Go to The default weight for a prefix that the router originates is 32768. When you announce a network into the global internet BGP routing table, your originating ASN is included. Feb 15, 2016 · Configuring BGP Neighbor Session Options; BGP Neighbor Policy; BGP Dynamic Neighbors; BGP Support for Next-Hop Address Tracking; BGP Restart Neighbor Session After Max-Prefix Limit Reached; BGP Support for Dual AS Configuration for Network AS Migrations; Configuring Internal BGP Features; BGP VPLS Auto Discovery Support on Route Reflector Feb 15, 2016 · Configuring BGP: RT Constrained Route Distribution; Configuring a BGP Route Server; BGP Diverse Path Using a Diverse-Path Route Reflector; BGP Enhanced Route Refresh; Configuring BGP Consistency Checker; BGP—Origin AS Validation; BGP MIB Support; BGP 4 MIB Support for Per-Peer Received Routes Asplain as Default Autonomous System Number Formatting. R2 redistributes BGP into EIGRP AS 1. BGP Router Configuration. For more details about route dampening, see the "Configuring Internal BGP Features" module. You need a BGP router reflector. BGP uses the routing information to maintain a database of network reachability information, which it exchanges with other BGP How to Configure Internal BGP Features. The default value of Local Preference is 100. 1. SD-WAN path selection is based on the configured SLA. May 4, 2023 · Learn how to configure BGP routing in Packet Tracer 7. In Junos OS Release 8. May 5, 2017 · In addition, the routers CE1 and CE2 are configured to establish internal BGP (iBGP) neighborship to each other. By default, iBGP does not propagate to other. In this example, routers R1 and R2 communicate with each other using EIGRP. Next-hop changes are rapidly reported to the BGP routing process as they are updated in the RIB. iBGP peering is configured on each VPN. The configuration of iBGP peers in Cisco IOS follows the same basic sequence of steps that is used when configuring eBGP peers. If you do not enter this command, and you also do not configure BGP filtering policies, the Firebox cannot learn routes from the BGP peer or announce routes to the BGP peer. 3 weight 500. This document describes the Border Gateway Protocol (BGP), one of the key protocols to use to achieve Internet connection redundancy. Allows the use of external, internal, and local administrative distances that could be a better route to a node. Let me show you an example: In my example AS 1 wants to make sure traffic enters the autonomous system through R2. First of all you must configure BGP router with the ASN. 2. In this task, several address family configurations are shown and the router ID is configured in the IPv4 address family mode for one VRF instance. Of all the routing protocols, BGP has the highest default preference value, which means that routes learned by BGP are the least likely to become the active route. Example: Configuring the BGP Best External Feature; Example: Configuring a Best External Path on an RR for an Intercluster Feb 18, 2021 · set protocols bgp group BGP-Internal type internal. Configuring a Routing Domain Confederation. Many companies now have large internal Jun 22, 2017 · Configuring BGP is a little bit different from other protocols, this BGP configuration sample helps you deeply to understand the BGP configuration. 1 for the BGP advertisement sent from CE1 to CE2, we must add the command neighbor 1. Mar 21, 2012 · In a BGP AS (this AS is running some IGP for internal reachbility purpose). # Configure Router B. 0 mask 255. The next time a protocol is initialized or reinitialized, the new router ID is used. Learn how a BGP tunnel broker is used to provide IPv6 connectivity to a network that exists in a region of the Internet that supports only IPv4. R1 advertises two routes (1. 2 next-hop-self to the BGP configuration of the CE1 router. For example, you can configure a router running BGP to distinguish between the routes that are internal and external to the autonomous system. Neighbors are not configured automatically. Step 3 Add and configure policy lists. Internal BGP (iBGP) refers to running BGP on networking devices within one autonomous system. Single multi-homed: you are connected to two ISPs using single links. Perform this task to manually configure a BGP router ID for each VRF. MBGP can indicate whether an advertised prefix is to be used for unicast routing, multicast RPF checks or both. R1# %BGP-5-ADJCHANGE: neighbor 192 Nov 2, 2022 · This configuration is a new configuration of Router B that redistributes only the Intra-area route (10. There can be two scenarios possible: 1. The links are terminated in one router at a local autonomous system (AS) and in another router at a remote AS in a single-homed BGP environment. 1 remote-as 1. R1(config-router)#distance eigrp 90 160. Aug 9, 2021 · Sign in to the Sophos Firewall's console. All edge routers are running IBGP with each other. It selects the ISP which offers the best path Feb 15, 2016 · When a Border Gateway Protocol (BGP) speaking router with no local policy configured receives multiple network layer reachability information (NLRI) from the internal BGP (iBGP) for the same destination, the router will choose one iBGP path as the best path. Configure point-to-point peering sessions. 1 255. set routing-options static route 1. It also includes two examples. Local preference is sent to all internal BGP routers in your autonomous system. This works but we have to repeat the same commands over and over again. R1(config-if)#ip address 1. 0/24) into BGP and only OSPF Internal (Intra-area and Inter-area) routes are redistributed into BGP: Configuring a BGP Peer. First, you need to make BGP Neighbor Configuration then you must advertise the networks. Abstract. 0(32)SY8, 12. These extensions are called Multiprotocol BGP (MP-BGP) extensions. It’s an important topic to understand if you work at an ISP or at a large company that is connected to two or more ISPs. Configure IP addresses on tunnel interfaces for health checks and iBGP peerings: 2. 10/32). R1(config-router)#neighbor 2001:db8:0:12::2 remote-as 2. BGP is an exterior gateway protocol (EGP) that is used to exchange routing information among routers in different autonomous systems (ASs). 9. Step 4. Jul 29, 2021 · Internal BGP and External BGP support. Dual homed: you are connected to a single ISP using dual links. 255. . BGP determines network reachability based on IP prefixes that are available within autonomous systems (AS), where an AS is a set of IP prefixes that a network provides has designated to be a part of a single routing policy rule. these are the only routers on which BGP is enabled. Step 5 Add and configure Community Rules. The BGP router supports both iBGP and eBGP peering. The administrative distance can be modified. Local preference is the second BGP attribute. The BGP router ID, which is represented as a 32-bit value using an IPv4 address syntax, must be unique to the BGP peers of the device. This implementation describes the procedures for configuring iBGP peering between BIG-IP A and BIG-IP B, and eBGP peering between BIG-IP B and BIG-IP C. It is required to redistribute selected internal routes (10. MP-BGP with IPv6 adjacency & IPv6 prefixes. This is something you’ll have to do yourself with the neighbor x. cl/2zWp2Xi - This tutorial explains why we need Internal BGP, what IBGP split horizon is about and how to configure IBGP on Cisco IOS Routers. All four BGP deployment topologies employ the use of eBGP peering, and the fourth topology uses iBGP peering as well. BGP next-hop address tracking is event driven. Border Gateway Protocol (BGP) refers to a gateway protocol that enables the internet to exchange routing information between autonomous systems (AS). Solution. BGP Configuration Overview. To configure either, you must ensure that the appropriate ASNs are assigned to the local and remote BGP Routers. For information on configuring additional BGP paths, see Chapter10, “Configuring Advanced BGP” The best-path algorithm runs each time that a path is added or withdrawn for a given network. The BGP protocol uses the AS number for detecting whether the BGP connection is internal or external. 1 to improve your Cisco CCNP Route exam preparation : bgp neighbors, bgp show commands, IGP redistributi By default, the routing software assigns a preference of 170 to routes that originated from BGP. Aug 25, 2019 · 5. You can use local preference to choose the outbound external BGP path. x. 2(33)XNE, 12. [Router B-bgp] ipv4-family unicast[Router B-bgp-af-ipv4] import-route direct# View the BGP routing table of Router A. 9, you must manually enter the no bgp ebgp-requires-policy command to remove the policy requirement. Prefix processing can be controlled by adjusting BGP timers, altering how BGP handles path attributes, limiting the number of prefixes that the routing process will accept, and configuring BGP 4. R1(config)#router bgp 1. Feb 15, 2016 · When configuring BGP on a device that is enabled only for IPv6 (that is, the device does not have an IPv4 address), you must manually configure the BGP router ID for the device. It is a scalable, open standard interior gateway protocol (IGP) that supports multivendor network devices. Aug 25, 2023 · This document describes the Border Gateway Protocol (BGP), one of the key protocols to use to achieve Internet connection redundancy. 0(33)S3, 12. com Feb 13, 2024 · Alirio Zavarce. See full list on cisco. 0. Perform this task to configure BGP between two IPv4 devices (peers). R1(config-router)#neighbor 192. (This is how the router knows whether it is an iBGP or eBGP neighbor. The first example shows you how to create an external BGP point-to-point peer session between two ASs. Feb 15, 2016 · BGP peers within the same organization exchange routing information through internal BGP (iBGP) peering sessions. The address family configured here is the default IPv4 unicast address family, and the configuration is done at Router A in the figure above. Step 4 Add and configure AS path filters. 1 /32 and 10. This is how we configure external BGP. When configuring a new router ID, protocols are not automatically restarted with the new router ID. May 13, 2013 · The command "bgp redistribute-internal" allow sthe redistribution of iBGP routes into an interior gateway protocol such as IS-IS or OSPF non in to other iBGP peer. Get a BGP autonomous system number (ASN) that identifies your network. Not exchanged between external BGP routers. Step 6 Configure IPv4 Address Family settings. Hello packets are sent at a specified, regular interval. Then we configure the neighbor statement with the IP address of the other BGP router, and specify the AS that other router is in. We can add our own autonomous system number multiple times, so Configure BGP to import direct routes. In Cisco IOS Release 12. Figure 1-6 illustrates this concept. BGP selects the best path from the set of valid paths available for a given network. 1 remote-as 1 Use the router bgp command with the AS number to start BGP. 108. Especially when we use redistribution, we sometimes have to change the administrative distance. Perform the following steps to configure BGP with BGP-LS: Enable the BGP routing protocol and enter router configuration mode. This introductory level Techtorial will cover foundational aspects of the Border Gateway Protocol (BGP) and explore many details of the protocol, including best practices needed to ensure a successful deployment of BGP into your network. The AS number is an identifier for the autonomous system. See the Ethernet Interfaces User Guide for Routing Devices. Nov 8, 2011 · This module describes how to configure internal Border Gateway Protocol (BGP) features. Configuring the BGP Best External Feature; Verifying the BGP Best External Feature; Configuring Best External Path on an RR for an Intercluster; Configuration Examples for BGP Best External. The show log ospf-bgp-policy-log command displays information about the routes that the injectpolicy1 policy term analyzes and acts upon. Local preference is the second BGP attribute and is used to choose the exit path for an autonomous system. BGP is the only routing protocol in use today that is suited to carry all of the routes in the Internet. R1(config-router)#address-family ipv4. 10. The BGP preference has to be set inbound on routes being received to influence the outbound routing behaviour. For BGP to support IPv6 or multicast, BGP is extended. 22. Now the next step is to advertise Aug 30, 2023 · Load Sharing with the Loopback Address as a BGP Neighbor. Oct 27, 2014 · This is how we configure basic EBGP, start with the router bgp “AS number” command to enable the BGP process. Configure a route map to prevent advertisement of iBGP routes to ISP 2: Go to Network > Routing Objects and click Create New > Route Map. A higher local preference is preferred and the default is 100. Routing Policy configuration: Till the above commands we have successfully established BGP connectivity between the routers. Let’s start with a simple example where we use IPv6 for the neighbor adjacency and exchange some IPv6 prefixes. Identify the BGP neighbor’s IP address and autonomous system number with the BGP router configuration command neighbor ip-address remote-as as-number. Say R1, R3 and R5 in attached diagram are running IBGP. The update-source, ebgp-multihop and route-map are the same. This is accomplished through peering. The path with Nov 1, 2017 · https://nwl. 2. Nov 27, 2020 · BGP on internet and we use BGP for different vendors and internal stuff that is not on the Internet. Mar 18, 2014 · Step 1 In the CLI, enable BGP, and configure general BGP parameters. distance bgp. In other words, here, it shows the exit point of your AS towards another AS. 1 BGP Configuration Guide, Cisco IOS Release 15E 7 You may optionally announce (and receive) the validation state of a prefix to (and from) internal BGP (iBGP) neighbors by using an extended community attribute. When multihop is configured, the Junos OS sets the TTL value of 64, by default. 0/24 in the BGP table on R2 or R3. May 23, 2012 · This document describes how to configure MP-EBGP in Cisco IOS routers. How to Configure Internal BGP Features. 21. Branch has 1 Internet connection with 2 Ipsec tunnels toward HQ ISP1 and HQ ISP2. You can verify this by taking a look at prefix 2. Many companies BGP neighbor is 172. Routers R2 and R3 use eBGP. Topics of our session include BGP General Operation, Attributes and Policy Control, BGP Path BGP policy configuration is used to control prefix processing by the BGP routing process and to filter routes from inbound and outbound advertisements. Feb 15, 2016 · For internal BGP (iBGP) sessions and external BGP (eBGP) sessions that are either single hop or multihop, BGP can use of the multihop BFD support to help improve the BGP convergence because BFD detection and failure times are faster than the IGP convergence times in most of the network topologies. I will start with a fresh BGP Conclusion. Would be surprising if even newer routers like Cat8500 can't have more than one totally independent BGP. router bgp For example, Device(config-if)# router bgp 100 Configure the address-family link-state. Feb 7, 2017 · BGP uses the same concept: If a BGP session is established between two neighbors in different autonomous systems, the session is external BGP (EBGP), and if the session is established between two neighbors in the same AS, the session is internal BGP (IBGP). ARIN can assign you an ASN for a nominal cost. If you add a new BGP configuration after you upgrade to Fireware v12. External Border Gateway Protocol (eBGP) is used when BGP runs between peers in a different AS. 1. Without it, networks would not be able to send and receive BGP (Border Gateway Protocol) is the routing protocol of the Internet, used to route traffic from one autonomous system (AS) to another. The Bidirectional Forwarding Detection (BFD) protocol is a simple hello mechanism that detects failures in a network. We would use private ASNs because we use BGP internally in our This module describes how to configure internal Border Gateway Protocol (BGP) features. A TTL value of 1 is sufficient to enable an EBGP session to the loopback address of a directly connected neighbor. R2(config)#router bgp 2 R2(config-router)#neighbor 192. Multihoming provides redundancy and network optimization. Configuring Fast Session Deactivation for a BGP Neighbor; Configuring Selective Address Tracking for Fast Session Deactivation Nov 30, 2017 · Internal Border Gateway Protocol (iBGP) is used when BGP runs between two peers in the same AS. Less is more! We can manipulate this by using AS path prepending. Click OK. Step 2 Define the best path for the BGP routing process and configure the best path configuration parameters. Here’s the topology I will use: Here’s the configuration of R1: R1(config)#router bgp 1. After this configuration, you have to see an informational log on your CLI screen as the following: The TCP The configuration of R2 requires some explanation. network (BGP and multiprotocol BGP) Nov 26, 2012 · The BGP next-hop address tracking feature is enabled by default when a supporting Cisco software image is installed. Table of Contents. To configure a BGP confederation, you must specify a confederation identifier. BGP prefixes are automatically tracked as peering sessions are established. And always, the highest one is chosen as Aug 25, 2022 · Configure the BGP on the remote end. address-family link-state link-state For example, Understand how the BGP local preference attribute determines the preferred outbound path from the local AS by following examples and instructions. 4. The configuration of MP-BGP support for CLNS does not support the creation and use of BGP confederations within the CLNS network. Enable BGP. The NEXT_HOP is a well-known mandatory attribute that defines the IP address of the router that SHOULD be used as the next hop to the destinations listed in the UPDATE message. When sending the UPDATE message to an internal BGP peer, if the route is not locally originated, there can be reachability issues from Internal BGP peer Feb 15, 2016 · How to Configure BGP Best External. If you configure policy tracing as shown in this example, you can run the show log ospf-bgp-policy-log command to diagnose problems with the routing policy. Administer network policies BGP has the flexibility to allow autonomous system administrators to implement their own routing policies. This module describes how to configure internal Border Gateway Protocol (BGP) features. FAI_2 (config-router)#neighbor 12. network network-number [mask network-mask] [route-map route-map-name] The administrative distance is only local and can be different for each router. BGP Neighbor Description. First of all, when you start the BGP process, you have to use the AS number of the sub-AS. BGP Tunnel Broker. The neighbor “@ip of neighbor” remote-as “AS number of the neighbor” specifies your neighbor IP address and his AS. In this Packet Tracer BGP Configuration Example, we will learn how to configure BGP on Cisco Routers with Cisco Packet Tracer. Local Preference shows the best outbound interface towards another AS. Configure EIGRP between R2 & R3: In the scenario depicted here, routers R1 and R2 run IBGP, and routers R2 or R3 run EIGRP Autonomous System (AS) 1. 12. To the outside world, the group of autonomous systems will look like a single autonomous system with the confederation identifier as the autonomous system number. In contrast, the internal gateway protocols (IGPs) do not have flow control. Similarly, in order to redistribute EIGRP routes in to BGP, use the redistribute eigrp AS number command. Jun 4, 2018 · Scenario : HQ has 2 Internet connections called ISP1 and ISP2. 13. 4 to 1. BGP enables peering to send packets between autonomous systems ( ASes Jun 26, 2023 · Configure. We would like to show you a description here but the site won’t allow us. For the preceding configuration, the External_fw gateway has two routes, which it has learned from an EBGP peer, and it advertises them to its IBGP peer; the Internal_fw gateway. BGP redundancy design sees an ASN as a collection of routers grouped together. VyOS does not have a special command to start the BGP process. First, we’ll configure R1 and R2. mojdvfscdnqrvzmeldsj
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