Incident 4

Figure 1-10. Incident 4 Diagram

Users on R3’s 120.100.3.0/24 subnet are still complaining that they cannot access resources located on their remote VPN site on VLAN 20 (switch 2). It appears that the MPLS VPN is not functioning correctly.

Investigate the issue and prove connectivity between PE routers via extended ping from R4 VLAN 4 interface and R7 VLAN 27 interface to prove MPLS functionality, as follows:

R4# ping vrf ROUTERS 120.100.27.7 source 120.100.4.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 120.100.27.7, timeout is 2 seconds:
Packet sent with a source address of 120.100.4.4
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms

R7# ping vrf ROUTERS 120.100.4.4 source 120.100.27.7
Type escape sequence to abort.