Next Hop Attribute - Lenovo RackSwitch G8264CS Application Manual

Next Hop Attribute

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BGP routing updates sent to a neighbor contain the next hop IP address used to
reach a destination. In eBGP, the edge router, by default, sends its own IP address
as the next hop address. However, this can sometimes cause routing path failures
in Non‐Broadcast Multiaccess Networks (NBMA) and when the edge router sends
iBGP updates.
To avoid routing failures, you can manually configure the next hop IP address. In
case of NBMA networks, you can configure the external BGP speaker to advertise
its own IP address as the next hop. In case of iBGP updates, you can configure the
edge iBGP router to send its IP address as the next hop.
Next hop can be configured on a BGP peer or a peer group. Use the following
commands:
 Next Hop for a BGP Peer
RS 8264CS(config)# router bgp
RS 8264CS(config-router-bgp)# neighbor <number> next-hop-self
 Next Hop for a BGP Peer Group:
RS 8264CS(config)# router bgp
RS 8264CS(config-router-bgp)# neighbor group <number> next-hop-self
Chapter 28: Border Gateway Protocol
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