R3303-HP 6600/HSR6600 Routers MPLS Configuration Guide

297
Ste
p
Command Remarks
8. Configure a filtering policy
to filter the received routes.
filter-policy { acl-number | ip-prefix
ip-prefix-name } import
Optional.
By default, BGP does not
filter the received routes.
BGP checks routing loops by examining AS numbers. When EBGP is used, the MCE advertises routing
information carrying the local AS number to the site and then receives routing updates from the site. The
routing updates carry the AS number of the MCE, so the MCE discards them to avoid routing loops. To
enable the MCE to receive such routes, configure the MCE to allow routing loops.
Routes redistributed from OSPF to BGP on the MCE have their OSPF attributes removed. To enable BGP
to distinguish routes redistributed from different OSPF domains, you must enable the redistributed routes
to carry the OSPF domain ID by configuring the domain-id command in OSPF view. The domain ID is
added to BGP VPN routes as an extended community attribute.
BGP runs in a BGP VPN instance in the same way as it runs in a normal network. For more information
about BGP, see Layer 3—IP Routing Configuration Guide.
2. Configure the VPN site:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view.
bgp as-number N/A
3. Configure the MCE as the
EBGP peer.
peer { group-name | ip-address }
as-number as-number
N/A
4. Redistribute the IGP routes of
the VPN.
import-route protocol [ process-id ]
[ med med-value | route-policy
route-policy-name ] *
Optional.
A VPN site must advertise the VPN
network addresses it can reach to
the connected MCE.
Configuring IBGP between MCE and VPN site
If IBGP is used for exchanging routing information between an MCE and VPN sites, you must configure
a BGP peer for each VPN instance, and redistribute the IGP routes of each VPN instance on the VPN
sites.
1. Configure the MCE:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view.
bgp as-number N/A
3. Enter BGP-VPN instance view.
ipv4-family vpn-instance
vpn-instance-name
N/A
4. Configure an IBGP peer.
peer { group-name | ip-address }
as-number as-number
N/A