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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
2-51
between CSC-CEs and between CSC-CE and ASBR can only propagate external routes, or else
routing loop or chaos may incur. To achieve this goal, we must execute "neighbor route-map
{in | out}" on IBGP neighbor and EBGP neighbor to filter the corresponding routes, and the
AS-path filtering rule is generally used. Of course, you can also use other rules.
Command Function
DES-7200(config)# ip as-path
access-list access-list-number
{permit | deny} regex
Configure AS-path ACL
DES-7200(config)# route-map
route-map-name {permit | deny}
sequence-number
Configure route map
DES-7200(config-route-map)# match
as-path access-list-number
Match AS-path ACL
DES-7200(config-route-map)# exit
Exit global configuration mode
DES-7200(config)# router bgp asn
Configure BGP router
DES-7200(config-router)# neighbor
{peer-address | peer-group-name}
route-map route-map-name {in | out}
Apply route map to BGP neighbor
Second Carrier provides Internet service based on MPLS
In Scenario II, the Second Carrier is a MPLS core network in which adjacencies are established
between ASBRs to exchange external routes. There is no need to propagate external routes via
CSC-CE. The configuration task mainly involves:
z Configure intra-site MPLS network
z Configure inter-site IBGP session
Configure intra-site MPLS network
The configuration of Second Carrier intra-site MPLS network is the same as "Configuring an
MPLS network" in the previous section of "Configuring basic BGP/MPLS VPN Functions".