Configuring Inter-Provider Vpn Option C - 3Com MSR 50 Series Configuration Manual

1492 C 79: MPLS L3VPN C
HAPTER
n
c
Configuring
Inter-Provider VPN
Option C
ONFIGURATION
To do...
Enter interface view for the
interface connecting to the
remote ASBR-PE
Configure the IP address of
the interface
Return to system view
Enter BGP view
Enter BGP-VPNv4 subaddress
family view
Disable VPN target filtering for
VPNv4 routes
In the inter-provider VPN option B solution, the ASBR PEs need to maintain all
VPNv4 routing information and advertise the information to peer ASBR PEs. In this
case, the ASBR PEs must receive all VPNv4 routing information without performing
VPN target filtering.
In the inter-provider VPN option B solution, for the same VPN, the VPN targets for
the VPN instances of the PEs must match those for the VPN instances of the
ASBR-PEs in the same AS. This is true for PEs in different ASs.
CAUTION: For inter-provider VPN option B, two configuration methods are
available
Do not change the next hop on an ASBR. With this method, you still need to
■
configure MPLS LDP between ASBRs.
Change the next hop on an ASBR. With this method, MPLS LDP is not required
■
between ASBRs.
Currently, only the second method is supported. Therefore, MP-EBGP routes will
get their next hops changed by default before being redistributed to MP-IBGP. On
conventional BGP, however, EBGP routes to be advertised to IBGP do not have
their next hops changed by default. If the next hops need to be changed to the
local addresses, you can configure the peer { ip-address | group-name }
next-hop-local command. For information about the command, refer to
Configuration" on page
Configuring the PEs
You need to establish ordinary IBGP peer relationship between PEs and ASBR PEs
in an AS and MP-EBGP peer relationship between PEs of different ASs.
The PEs and ASBR PEs in an AS must be able to exchange labeled IPv4 routes.
Follow these steps to configure a PE for inter-provider VPN option C:
Use the command...
interface interface-type
interface-number
ip address ip-address { mask |
mask-length }
quit
bgp as-number
ipv4-family vpnv4
[ unicast ]
undo policy vpn-target
825.
Remarks
-
Required
-
-
-
Required
By default, PE performs VPN
target filtering of the received
VPNv4 routes.
The routes surviving the
filtering will be added to the
routing table, and the others
are discarded.
"BGP