Pinging the Directly Connected PE Routers from the CE Routers
From the loopback interfaces on the CE routers, you can ping the VPN interface on the directly connected PE router. Troubleshooting Layer 3 VPNs Using ping and traceroute shows the topology referenced in the following examples:
Pinging Router PE1 from the Loopback Interface on Router CE1
From the loopback interface on Router CE1 (VPN4), ping the VPN interface, fe-1/1/0.0, on Router PE1:
user@vpn4> ping 192.168.192.1 local
10.255.10.4 count 3PING 192.168.192.1 (192.168.192.1): 56 data bytes 64 bytes from 192.168.192.1: icmp_seq=0 ttl=255 time=0.885 ms 64 bytes from 192.168.192.1: icmp_seq=1 ttl=255 time=0.757 ms 64 bytes from 192.168.192.1: icmp_seq=2 ttl=255 time=0.734 ms --- 192.168.192.1 ping statistics --- 3 packets transmitted, 3 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.734/0.792/0.885/0.066 ms
Using traceroute from the Loopback Interface on Router CE1 to PE1
To determine the path from the loopback interface on Router CE1 to the VPN interfaces on Router PE1, use the traceroute command:
user@vpn4> traceroute 192.168.192.1
source 10.255.10.4traceroute to 192.168.192.1 (192.168.192.1) from 10.255.10.4, 30 hops max, 40 byte packets 1 vpn1-fe-110.isp-core.net (192.168.192.1) 0.828 ms 0.657 ms 1.972 ms
Pinging Router PE2 from the Loopback Interface on Router CE2
From the loopback interface on Router CE2 (VPN5), ping the VPN interface, t3-0/0/3.0, on Router PE2:
user@vpn5> ping 192.168.193.2 local
10.255.10.5 count 3PING 192.168.193.2 (192.168.193.2): 56 data bytes 64 bytes from 192.168.193.2: icmp_seq=0 ttl=255 time=0.998 ms 64 bytes from 192.168.193.2: icmp_seq=1 ttl=255 time=0.834 ms 64 bytes from 192.168.193.2: icmp_seq=2 ttl=255 time=0.819 ms --- 192.168.193.2 ping statistics --- 3 packets transmitted, 3 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.819/0.884/0.998/0.081 ms
Using traceroute from the Loopback Interface on Router CE2 to PE2
To determine the path from the loopback interface on Router CE2 to the VPN interfaces on Router PE2, use the traceroute command:
user@vpn5> traceroute 192.168.193.2
source 10.255.10.5traceroute to 192.168.193.2 (192.168.193.2) from 10.255.10.5, 30 hops max, 40 byte packets 1 vpn-08-t3003.isp-core.net (192.168.193.2) 0.852 ms 0.670 ms 0.656 ms