Do we have to use address-family ipv4 in this ars1k

eemoon used Ask the Experts™
Please see the below in asr1000 trying to establish bgp neighbor. Do we have to use address-family ipv4? Thank you

router bgp 22
 bgp log-neighbor-changes
 neighbor remote-as 33
 address-family ipv4
  neighbor activate
  neighbor soft-reconfiguration inbound
  neighbor prefix-list ine in
  neighbor prefix-list out out
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Distinguished Expert 2018
In some versions you did not have to specify it (at least in IOS, maybe on ASR it was always requirement, not sure about it), but in new code versions it is required (during upgrade configuration will/need to be converted). Beside address family ipv4 or ipv6 and it may be needed to specify is it unicast or multicast (if it is not specified it is considered unicast).

address-family ipv4 unicast

It is new standard (even for named EIGRP instances), so it is better to start with new convention as soon as possible on devices that support format.


understood it., Thank you

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