There are four ways to distribute a default route in BGP. Three of them, the network 0.0.0.0, the default-information originate and redistribution from another routing protocol, are all similar in the resulting effect: they will inject the default route into BGP RIB and it will be advertised to all BGP neighbors. The difference is inContinue reading “Advertising a default route in BGP”
Category Archives: BGP
To verify advertised BGP routes within a VRF
We can verify each BGP address family now maintains routes for its respective VRF. In order to view the BGP routes for a specific VRF, use the following command: router#show ip bgp vpnv4 vrf <%vrfname%> neighbors <%ipaddress%> advertised-routes
MP-eBGP Configuration
Some information on how to configure multiprotocol extended Border Gateway Protocol (MP-EBGP). Extended BGP allows for the transport of routing information for multiple network layer protocols IPv6, VPNv4, and others. MP-BGP allows you to have a unicast routing topology different from a multicast routing topology, which helps to control the network and resources. In this example, theContinue reading “MP-eBGP Configuration”
More BGP next-hop-self
From the below you can see the next hop for 192.168.0.0 network is 10.0.0.2 which is outsite of 65000 AS, and router jazz doesn’t have a route to it. BGP will not put 192.168.0.0 into routing table because it doesn’t know how to reach next hop, you can see this below: By adding the next-hop-self commandContinue reading “More BGP next-hop-self”
eBGP Configuration with a Loopback Address
You can also configure eBGP using a loopback address (or any other operational interface) as shown in this section. Loopback interfaces are used in this manner to guarantee reachability in networks with multiple paths as shown in the Load Sharing Using the Loopback Address as a BGP Neighbor section of Load Sharing with BGP in SingleContinue reading “eBGP Configuration with a Loopback Address”
Basic eBGP Configuration
In this configuration, the router owen is in AS 300 and Router jazz is in AS 400. Peers must be directly connected when using eBGP. If they are not directly connected, the neighbor ebgp-multihop command must be used and a path through an IGP or static route to reach the peer must exist in order forContinue reading “Basic eBGP Configuration”
Basic iBGP Configuration
In this configuration, both routers are in AS 400.
More BGP info
Just came across some useful info from these BGP Case Studies.
BGP Update Source
Running a dual link configuration to ensure no SPOF using BGP and EIGRP.
BGP Basic Configuration
Because my brain and eyesight are failing fast, i have to write it down nowadays, here’s a very basic BGP configuration with 3 different Autonomous System (AS) Numbers.
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