The Cisco 6PE solution enables IPv6 domains to communicate with each other over an MPLS IPv4 core network. MP-BGP in the IPv4 network is used to exchange IPv6 reachability information along with a label for each IPv6 prefix announced. 6PE routers are dual-stack routers i.e. running IPv6 with the customers and IPv4 in the core.
6PE routers do the following:
Participate in V4 IGP to establish internal reachability inside the MPLS cloud
Participate in LDP for binding V4 labels
Run MP-BGP4 (Multi-Protocol iBGP) to advertise v6 reachability and distribute V6 labels among them
The labels can be distributed as follows:
Per-Prefix label - The 6PE node distributes labels for each IPv6 prefix learnt from interfaces connected to CE routers
Run IPv6 routing protocols (eBGP6, Static, ISIS v6, OSPF v3 , EIGRP v6, iBGP) with CE routers to advertise V6 reachability learnt from their peers over the MPLS cloud
IGP protocol between CE to PE has to be redistributed into MP-iBGP for end to end reachability
6PE with iBGP between CE and PE
6PE with iBGP between PE and CE is supported since IOS-XR 4.0. Unlike IOS an important mandatory configuration command is required in IOS-XR. It is required to configure "ibgp policy out enforce-modifications" under router bgp <AS> to allow changing attributes on the RR for reflected routes.
Hi guysI have to configure an xconnect between a PE with ios XR version and a PE with ios XE version.The scenario is as follows: I have 2 switches that have vlan, in this case 100, which must communicate through an MPLS network.The MPLS network...
Hi! I have a question about label allocation. I can't figure out how can I controll this behavior. I have a few PEs, all of them ASR9010.There's one that allocates a new local label for each vpnv4 prefix it receives from RR, even if label mode p...
Hi all!! We are using ASR9001 for BNG. It's connected to ASR9010 with bunble 4x10G.To police users traffic correct, on BNG bundle subinterfaces this command it presented: bundle load-balancing hash dst-ipThis is for users download. For upload we...
Hi, there are these syslog message that we occasionally get on our XR router with regards to BGP NSR going down on the standby RP. When we check the BGP neighborship or BGP NSR related commands were not seeing any flaps or anything unusual. Any parti...