05-24-2016 09:15 AM
hi experts, I have 2 doubts : plz help
1.what is the use of "allocate-label all" : command ?
eg : address-family ipv6 unicast
allocate-label all
2. under which scenario we use below config ? ipv4 address under ipv4 add family.
address-family ipv6
neighbor <IPV4 Address> activate
Solved! Go to Solution.
05-24-2016 09:29 AM
Hi Arjun,
1.what is the use of "allocate-label all" : command ?
<Nagendra>For 6PE scenarios (IPv6 over IPv4 LSP), border nodes needs to exchange a label for each IPv6 Prefix. "allocate-label all" is used to assign and advertise label for IPv6 prefixes.
2. under which scenario we use below config ? ipv4 address under ipv4 add family.
<Nagendra> BGP is multi protocol capable. In simple words, a single session between 2 neighbors is sufficient to advertise different address-families. For example, you can have a single IPv4 session over whcih you can advertise IPv4, VPNv4, IPv6, VPNv6, MVPN etc.
In your case, when you enable "neighbor <ipv4> activate" under IPv6 address-family, you are allowing the node to exchange IPv6 prefixes (redistributed into local BGP table) to this neighbor. You may hvae to tweak the nexthop to make it work.
-Nagendra
05-24-2016 09:31 AM
1. This command is used to allocate labels by BGP. This is similar to having send-label command in Cisco IOS. This command is generally used in Inter-AS MPLS VPNs or when you want BGP to allocate labels rather than LDP
2. address-family ipv6 is used when you want to establish IPv6 neighborship and exchanging IPv6 routes
Regards
Vinit
05-24-2016 09:29 AM
Hi Arjun,
1.what is the use of "allocate-label all" : command ?
<Nagendra>For 6PE scenarios (IPv6 over IPv4 LSP), border nodes needs to exchange a label for each IPv6 Prefix. "allocate-label all" is used to assign and advertise label for IPv6 prefixes.
2. under which scenario we use below config ? ipv4 address under ipv4 add family.
<Nagendra> BGP is multi protocol capable. In simple words, a single session between 2 neighbors is sufficient to advertise different address-families. For example, you can have a single IPv4 session over whcih you can advertise IPv4, VPNv4, IPv6, VPNv6, MVPN etc.
In your case, when you enable "neighbor <ipv4> activate" under IPv6 address-family, you are allowing the node to exchange IPv6 prefixes (redistributed into local BGP table) to this neighbor. You may hvae to tweak the nexthop to make it work.
-Nagendra
05-24-2016 09:31 AM
1. This command is used to allocate labels by BGP. This is similar to having send-label command in Cisco IOS. This command is generally used in Inter-AS MPLS VPNs or when you want BGP to allocate labels rather than LDP
2. address-family ipv6 is used when you want to establish IPv6 neighborship and exchanging IPv6 routes
Regards
Vinit
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide