3Com MSR 50 Series Configuration Manual page 1554

1554 C 79: MPLS L3VPN C
HAPTER ONFIGURATION
2 Configure BGP AS number substitution
# Configure BGP AS number substitution on PE 2.
<PE2> system-view
[PE2] bgp 100
[PE2-bgp] ipv4-family vpn-instance vpn1
[PE2-bgp-vpn1] peer 10.2.1.1 substitute-as
[PE2-bgp-vpn1] quit
[PE2-bgp] quit
You should see that among the routes advertised by PE 2 to CE 2, the AS_PATH of
100.1.1.1/32 has changed from 100 600 to 100 100:
*0.13498737 PE2 RM/7/RMDEBUG:
BGP.vpn1: Send UPDATE to 10.2.1.1 for following destinations :
Origin
AS Path
Next Hop
100.1.1.1/32
Display again the routing information that CE 2 receives and the routing table:
<CE2> display bgp routing-table peer 10.2.1.2 received-routes
Total Number of Routes: 5
BGP Local router ID is 10.2.1.1
Status codes: * - valid, > - best, d - damped,
h - history,
Origin : i - IGP, e - EGP, ? - incomplete
Network
*> 10.1.1.0/24
*> 10.1.1.1/32
* 10.2.1.0/24
* 10.2.1.1/32
*> 100.1.1.1/32
<CE2> display ip routing-table
Routing Tables: Public
Destinations : 9
Destination/Mask
10.1.1.0/24
10.1.1.1/32
10.2.1.0/24
10.2.1.1/32
10.2.1.2/32
100.1.1.1/32
127.0.0.0/8
127.0.0.1/32
200.1.1.1/32
After configuring BGP AS substitution on PE 1 too, the Ethernet interfaces of CE 1
and CE 2 should be able to ping each other:
<CE1> ping -a 100.1.1.1 200.1.1.1
PING 200.1.1.1: 56
Reply from 200.1.1.1: bytes=56 Sequence=1 ttl=253 time=109 ms
Reply from 200.1.1.1: bytes=56 Sequence=2 ttl=253 time=67 ms
Reply from 200.1.1.1: bytes=56 Sequence=3 ttl=253 time=66 ms
Reply from 200.1.1.1: bytes=56 Sequence=4 ttl=253 time=85 ms
Reply from 200.1.1.1: bytes=56 Sequence=5 ttl=253 time=70 ms
--- 200.1.1.1 ping statistics ---
5 packet(s) transmitted
: Incomplete
: 100 100
: 10.2.1.2
i - internal, s - suppressed, S - Stale
NextHop MED
10.2.1.2
10.2.1.2
10.2.1.2 0
10.2.1.2 0
10.2.1.2
Routes : 9
Proto Pre Cost
BGP 255 0
BGP 255 0
Direct 0 0
Direct 0 0
Direct 0 0
BGP 255 0
Direct 0 0
Direct 0 0
Direct 0 0
data bytes, press CTRL_C to break
LocPrf PrefVal Path/Ogn
0
0
0
0
0
NextHop Interface
10.2.1.2 Eth1/0
10.2.1.2 Eth1/0
10.2.1.1 Eth1/0
127.0.0.1 InLoop0
10.2.1.2 Eth1/0
10.2.1.2 Eth1/0
127.0.0.1 InLoop0
127.0.0.1 InLoop0
127.0.0.1 InLoop0
100?
100?
100?
100?
100 100?