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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
2-52
Note
You need to enable LDP on CSC-CE in order to establish sessions with
other intra-site devices in order to build MPLS network. If CSC-CE and
CSC-PE use BGP to exchange routes, then you must execute
"advertise-labels for bgp-routes" on CSC-CE to allow LDP to distribute
labels for BGP routes.
Configure IBGP session between ASBRs of different sites
Configure the BGP session between local ASBR and ASBR of peer site in order to exchange
external routes.
Command Function
DES-7200(config)# router bgp asn
Configure BGP
DES-7200(config-router)# neighbor
{peer-address | peer-group-name}
remote-as asn
Configure BGP neighbor
DES-7200(config-router)# neighbor
{peer-address | peer-group-name}
update-source interface-name
Configure BGP source address
DES-7200(config-router)# neighbor
{peer-address | peer-group-name}
next-hop-self
When configuring the ASBR router to
advertise external routes, change the next hop
to the router itself.
Note
To reduce the configuration cost of fully meshed IBGP session, the RR
role can be configured inside the site. Intra-site ASBR can establish BGP
session with RR, while inter-site BGP session will only be established
between RRs.
Second Carrier provides VPN service based on MPLS core
In Scenario III, the Second Carrier is a MPLS core network in which MP-IBGP adjacencies are
established between Second Carrier PEs to exchange user’s VPN routes. The configuration task
mainly involves:
z Configure intra-site MPLS network
z Configure MP-IBGP neighbor