H3C Technologies H3C SR8800 - Manual (Page 306)

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CEs of the same VPN can ping each other, whereas those of different VPNs can not. For example,
CE 1 can ping CE 3 (6.6.6.9), but cannot ping CE 4 (7.7.7.9):
[CE1] ping 6.6.6.9
PING 6.6.6.9: 56 data bytes, press CTRL_C to break
Reply from 6.6.6.9: bytes=56 Sequence=1 ttl=253 time=72 ms
Reply from 6.6.6.9: bytes=56 Sequence=2 ttl=253 time=34 ms
Reply from 6.6.6.9: bytes=56 Sequence=3 ttl=253 time=50 ms
Reply from 6.6.6.9: bytes=56 Sequence=4 ttl=253 time=50 ms
Reply from 6.6.6.9: bytes=56 Sequence=5 ttl=253 time=34 ms
--- 6.6.6.9 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 34/48/72 ms
[CE1] ping 7.7.7.9
PING 7.7.7.9: 56 data bytes, press CTRL_C to break
Request time out
Request time out
Request time out
Request time out
Request time out
--- 7.7.7.9 ping statistics ---
5 packet(s) transmitted
0 packet(s) received
100.00% packet loss
Configuring an MPLS L3VPN that uses a GRE tunnel
Network requirements
• CE 1 and CE 2 belong to VPN 1. The PEs support MPLS. The P router does not support MPLS and
provides only IP functions.
• On the backbone, use a GRE tunnel to encapsulate and forward VPN packets to implement MPLS
L3VPN.
Configure tunneling policies on the PEs and specify the tunnel type for VPN traffic as GRE.