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In this BGP configuration example, we\u2019ll use loopback interfaces for BGP peering. We prefer loopback interfaces when there are multiple paths between peers\u2026","rel":"","context":"In "bgp"","block_context":{"text":"bgp","link":"https:\/\/www.zframez.com\/articles\/category\/routing\/bgp"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/ebgp-configuration-topology.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/ebgp-configuration-topology.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/ebgp-configuration-topology.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/ebgp-configuration-topology.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/ebgp-configuration-topology.png?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/ebgp-configuration-topology.png?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":1273,"url":"https:\/\/www.zframez.com\/articles\/routing\/understanding-bgp-next_hop-and-origin-path-attributes","url_meta":{"origin":247,"position":1},"title":"Understanding BGP NEXT_HOP and ORIGIN Path Attributes","author":"sajith achipra","date":"August 6, 2025","format":false,"excerpt":"Understanding the NEXT_HOP Attribute in BGP In BGP, every route that gets advertised comes with some additional information known as path attributes. One of the most important and commonly seen among them is the NEXT_HOP attribute. This attribute simply tells the router: \u201cIf you want to reach this network, send\u2026","rel":"","context":"In "bgp"","block_context":{"text":"bgp","link":"https:\/\/www.zframez.com\/articles\/category\/routing\/bgp"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2025\/08\/ebgp-peers-with-NOH-attribute.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2025\/08\/ebgp-peers-with-NOH-attribute.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2025\/08\/ebgp-peers-with-NOH-attribute.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2025\/08\/ebgp-peers-with-NOH-attribute.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2025\/08\/ebgp-peers-with-NOH-attribute.png?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2025\/08\/ebgp-peers-with-NOH-attribute.png?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":240,"url":"https:\/\/www.zframez.com\/articles\/routing\/bgp-protocol-peering-and-states","url_meta":{"origin":247,"position":2},"title":"BGP Peering Process Explained \u2013 States from Idle to Established","author":"sajith achipra","date":"July 18, 2024","format":false,"excerpt":"Understanding the BGP Peering Process When routers run BGP , they don't start exchanging route information right away. Before they can share anything, they need to form a stable connection, called a BGP peering session. This process involves multiple states, each indicating what\u2019s happening behind the scenes as the routers\u2026","rel":"","context":"In "bgp"","block_context":{"text":"bgp","link":"https:\/\/www.zframez.com\/articles\/category\/routing\/bgp"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":219,"url":"https:\/\/www.zframez.com\/articles\/routing\/bgp-protocol","url_meta":{"origin":247,"position":3},"title":"Introduction to BGP Protocol","author":"sajith achipra","date":"July 17, 2024","format":false,"excerpt":"Introduction to BGP \u2013 The Backbone of Internet Routing In this tutorial, we\u2019ll go over the basics of BGP (Border Gateway Protocol) and what makes it different from other routing protocols. 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\n Table of Contents<\/h3>\n
\n
BGP Configuration Example 1: Configuring EBGP Peering on Cisco routers.<\/a><\/li>\n
Router Configurations<\/a><\/li>\n
Verifying the BGP Peering<\/a><\/li>\n
show ip bgp summary<\/a><\/li>\n
show ip bgp<\/a><\/li>\n
show ip bgp <network address><\/a><\/li>\n <\/ul>\n<\/div>\n\n\n\n
\n\n\n\n
BGP Configuration<\/strong> Example 1:<\/strong> Configuring<\/strong> EBGP Peering<\/strong> on Cisco routers<\/strong>. <\/h2>\n\n\n\n
In this example, your objective is to establish an EBGP peering<\/strong> between two routers, R1<\/strong> and R2<\/strong>, located in different autonomous systems as shown in the topology given below. You\u2019ll configure the EBGP peering<\/strong> using the IP addresses of the physical interfaces connecting these routers and advertise the loopback networks from both routers.<\/p>\n\n\n\n
Topology: <\/strong><\/p>\n\n\n\n
$\"A$
EBGP configuration topology<\/figcaption><\/figure>\n\n\n\n
As you can see in the topology, router R1 is in AS 1000, and R2 is in AS 2000. R1 has a loopback interface with the network 10.0.0.0\/8, and R2 with 20.0.0.0\/8. We need these loopback networks to ensure BGP can advertise and learn networks. For example, by checking whether R2 has learned the network 10.0.0.0\/8 via BGP, we can understand that R1 successfully advertised the network, and R2 was able to learn it.<\/p>\n\n\n\n
You can configure a basic BGP peering using 3 steps on a Cisco router: <\/p>\n\n\n\n
\n
Step 1: Use the \u201crouter bgp AS-number<\/em><\/strong>\u201d to enter BGP protocol configuration mode. <\/li>\n\n\n\n
Step 2: Use the \u201cneighbor Peer\u2019s-IP-Address<\/em> remote-as Peer\u2019s-AS-number<\/em><\/strong>\u201d to start the BGP peering process<\/li>\n\n\n\n
Step 3: Use the \u201cnetwork network-address<\/em> mask mask-of-the-network<\/em><\/strong>\u201d to advertise a network to the peer.<\/li>\n<\/ul>\n\n\n\n\n
Procedure Steps<\/h3>\n
\n
Configure IP addresses on the physical interfaces connecting R1 and R2.<\/li>\n
On both routers, add loopback interfaces and configure the IP addresses as specified in the topology. Verify connectivity by pinging from R1 to R2 to ensure connectivity.<\/li>\n
On both R1 and R2, configure BGP, add the neighbor, and advertise the loopback networks.<\/li>\n
Verify peering by checking the BGP peering status and verifying the entries in the BGP table.<\/li>\n <\/ol>\n<\/div>\n\n\n\n
\n\n\n\n
Router Configuration<\/strong> Commands<\/strong>:<\/h2>\n\n\n\n
R1 Configuration: Setting Up IP Addresses and Loopback Interface<\/strong><\/p>\n\n\n\n
R1#\nR1#configure terminal\nR1(config)#interface fastEthernet 0\/0\nR1(config-if)#ip address 192.168.1.1 255.255.255.0\nR1(config-if)#no shutdown\nR1(config-if)#int loopback 1\nR1(config-if)#ip address 10.0.0.1 255.0.0.0\nR1(config-if)#exit<\/strong><\/code><\/pre>\n\n\n\n \n\n\n\nR1 Configuration: Configuring BGP AS, Neighbor, and Network Advertisement<\/strong><\/p>\n\n\n\n R1(config)#router bgp 1000\nR1(config-router)#neighbor 192.168.1.2 remote-as 2000\nR1(config-router)#network 10.0.0.0 mask 255.0.0.0\nR1(config-router)#exit\nR1(config)#exit\nR1#<\/strong><\/code><\/pre>\n\n\n\n \n\n\n\nR2 Configuration: Setting Up IP Addresses and Loopback Interface<\/strong><\/p>\n\n\n\n R2#\nR2#configure terminal\nR2(config)#interface fastEthernet 0\/0\nR2(config-if)#ip address 192.168.1.2 255.255.255.0\nR2(config-if)#no shutdown\nR2(config-if)#exit\nR2(config)#interface loopback 1\nR2(config-if)#ip address 20.0.0.1 255.0.0.0\nR2(config-if)#exit<\/strong><\/code><\/pre>\n\n\n\n \n\n\n\nR2 Configuration: Configuring BGP AS, Neighbor, and Network Advertisement<\/strong><\/p>\n\n\n\n R2(config)#router bgp 2000\nR2(config-router)#neighbor 192.168.1.1 remote-as 1000\nR2(config-router)#network 20.0.0.0 mask 255.0.0.0\nR2(config-router)#exit\nR2(config)#exit\nR2#<\/strong><\/code><\/pre>\n\n\n\n \n\n\n\nNote that we use AS 1000 on R1 and AS 2000 on R2, making them EBGP peers. BGP starts the peering process when we issue the \u201cneighbor\u201d command. However, we need to ensure the neighbor\u2019s IP address matches the interface IP address on the neighbor, and the AS number of the neighbor is correctly configured<\/p>\n\n\n\n To advertise the network address of the loopback interface, we use the \u201cnetwork\u201d command. In BGP, we must manually specify the neighbor\u2019s IP address and advertise the networks separately. This differs from OSPF, EIGRP, or RIP, where only the \u201cnetwork\u201d command is needed.<\/strong><\/p>\n\n\n\n \n\n\n\nVerifying the BGP Peering:<\/strong><\/h2>\n\n\n\nYou can use the following \u201cshow\u201d commands on a Cisco router to check the BGP peering status, networks in bgp table, and details of the networks learned:<\/p>\n\n\n\n R1# show ip bgp summary \nR1# show ip bgp\nR1# show ip bgp <network address><\/strong><\/code><\/pre>\n\n\n\n \n\n\n\nChecking the peering<\/strong> with<\/strong> \u201cshow ip bgp summary\u201d<\/strong> :<\/h3>\n\n\n\nThe \u201cshow ip bgp summary\u201d command gives you a quick overview of the BGP status on your router. It shows the number of BGP neighbors, their IP addresses, and the current state of each peering session. You\u2019ll see the AS number of each peer, the number of routes received, and the duration of the established peering. This command helps you quickly assess the health and status of your BGP connections.<\/p>\n\n\n\n Output of \u201cshow ip bgp summary\u201d on R1<\/figcaption><\/figure>\n\n\n\n \n\n\n\nChecking the BGP database with \u201cshow ip bgp<\/strong>\u201d :<\/h3>\n\n\n\nThe \u201cshow ip bgp\u201d command provides detailed information about the BGP routing table on your router. It displays the routes learned through BGP, including the network prefixes, next-hop addresses, path attributes, and status codes. This command helps you see which routes BGP advertises, the path it takes to reach them, and any applied policies. It\u2019s a valuable tool for troubleshooting and verifying the routing information in your BGP configuration<\/p>\n\n\n\n Output of \u201cshow ip bgp\u201d on R1<\/figcaption><\/figure>\n\n\n\nUnderstanding \u201cshow ip bgp<\/code>\u201d Output<\/strong>:<\/h4>\n\n\n\nIn the output above, you can see two networks (10.0.0.0 and 20.0.0.0) in the BGP table. Status Code: *><\/strong> The status code will show * if a route is valid and the next hop is reachable. The > indicates that this path is the best path to the reachable destination. If the route is learned from an iBGP peer, the status code will be *>i. Next Hop:<\/strong> If the Next Hop column shows 0.0.0.0, it indicates that this network is directly connected. In the output above, R1 sets the next hop as 0.0.0.0 for the connected network 10.0.0.0. Metric:<\/strong> This column displays the value of the MED (Multi-Exit Discriminator) attribute. By default, MED is set to 0. LocPrf:<\/strong> The Local Preference attribute is not applicable for eBGP peering, so this column is not populated in this scenario. For routes learned from iBGP peers, the local preference is set to 100 by default. Weight:<\/strong> By default, the weight is set to 32768 for all local networks and 0 for iBGP and eBGP routes. Path and Origin Code:<\/strong> This column shows the value of the AS-PATH attribute. The symbol at the end of the line indicates the origin code. In the output above, the origin code is i, meaning that the network is originally advertised by a BGP-speaking router connected to that network.<\/p>\n\n\n\n \n\n\n\nChecking the path attributes with \u201cshow ip bgp <network address>\u201d <\/strong>:<\/h3>\n\n\n\nThe \u201cshow ip bgp \u201d command gives you detailed information about a specific BGP route. By specifying the network address, you can see all the path attributes associated with that route, including the next-hop IP address, AS path, origin, and any BGP policies applied. This command helps you analyze how BGP handles a particular route, making it easier to troubleshoot routing issues or verify the route\u2019s configuration.<\/p>\n\n\n\n Output of \u201cshow ip bgp 20.0.0.0\u201d on R1<\/figcaption><\/figure>\n\n\n\nIn this BGP configuration example, we discussed BGP peering using the IP addresses of the peers\u2019 physical interfaces. Next, we will learn how to use loopback interfaces to form the peering.<\/p>\n\n\n\n \n\n\n\n\n Next >>> BGP Configuration Example 2: EBGP Using Loopback Interfaces<\/a> \n Previous >>> BGP Protocol Peering and States<\/a>\n<\/p>\n\n\n\n Further reading: Cisco<\/a><\/p>\n\n\n\n <\/p>\n<\/body>","protected":false},"excerpt":{"rendered":" BGP Configuration Example: In the previous chapter, you learned about BGP\u2019s peering process and states. In this BGP configuration example , you will learn how to configure BGP with two Cisco routers, check the BGP peering status, and understand different BGP show commands. We\u2019ll provide step-by-step instructions to set up an EBGP peering, verify the […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"wp-custom-template-post-with-sidebar2","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[103,66],"tags":[144,136,143,137,139,138,141,142],"class_list":["post-247","post","type-post","status-publish","format-standard","hentry","category-bgp","category-routing","tag-bgp-commands","tag-bgp-configuration-examples","tag-cisco-bgp-commands","tag-cisco-bgp-configuration","tag-ebgp-configuration","tag-ebgp-peering","tag-show-ip-bgp","tag-show-ip-bgp-network-address"],"yoast_head":"\nBGP Configuration Example 1: EBGP Peering - Tutorials<\/title>\n<meta name=\"description\" content=\"Explore a BGP configuration example with eBGP peering commands and verification using show commands on a cisco router.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.zframez.com\/articles\/routing\/bgp-configuration-examples\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"BGP Configuration Example 1: EBGP Peering - 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In this BGP configuration example, we\u2019ll use loopback interfaces for BGP peering. 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This process involves multiple states, each indicating what\u2019s happening behind the scenes as the routers\u2026","rel":"","context":"In "bgp"","block_context":{"text":"bgp","link":"https:\/\/www.zframez.com\/articles\/category\/routing\/bgp"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.zframez.com\/articles\/wp-content\/uploads\/2024\/07\/bgp-states.png?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":219,"url":"https:\/\/www.zframez.com\/articles\/routing\/bgp-protocol","url_meta":{"origin":247,"position":3},"title":"Introduction to BGP Protocol","author":"sajith achipra","date":"July 17, 2024","format":false,"excerpt":"Introduction to BGP \u2013 The Backbone of Internet Routing In this tutorial, we\u2019ll go over the basics of BGP (Border Gateway Protocol) and what makes it different from other routing protocols. 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