Routing

Hi

Why the ping command is not complicated? I have to use the below command to ping.Otherwise it cannot work. The destination and source are connected directly. Anyone can give some suggestion? Thank you

ping 6.1.1.1.1 bypass-routing interface ge-1/1/3

Hi,

Its possible to source the ping from different interfaces. From that command you are sourcing the ping from ge-1/1/3 and bypassing the routing table for this destination.

Can you check for the route of this address:

show route x.x.x.x

Also, the IP address 6.1.1.1.1 does not sound right.

Cheers,

Ashvin

 Sorry. it should be 6.1.1.1.

show route x.x.x.x will show some production info, so, ...
i wonder why ping 6.1.1.1 cannot work, instead this can work: ping 6.1.1.1 bypass-routing interface ge-1/1/3. it is two rotuer connected directly 

Hi,

When you run "ping 6.1.1.1", the ping is being initiated from the default instance [inet.0].

If there is a route for 6.1.1.1 in inet.0, the ping should be able to use the egress interface of that route.

In this case, there should be a direct route for 6.1.1.1 in the routing-table where the interface is configured.

Possible reasons why the ping does not work is when the interface is in a routing-instance.

Example:

root@PE01# run show route table inet.0 192.168.102.2    

[edit]
root@PE01# run ping 192.168.102.2 
PING 192.168.102.2 (192.168.102.2): 56 data bytes
ping: sendto: No route to host
ping: sendto: No route to host
^C
--- 192.168.102.2 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss

root@PE01# run ping bypass-routing interface ge-0/0/1 192.168.102.2    
PING 192.168.102.2 (192.168.102.2): 56 data bytes
64 bytes from 192.168.102.2: icmp_seq=0 ttl=64 time=3.483 ms
64 bytes from 192.168.102.2: icmp_seq=1 ttl=64 time=2.255 ms
^C
--- 192.168.102.2 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 2.255/2.869/3.483/0.614 ms

The interface was in a routing-instance TEST-VRF:

root@PE01# run show interfaces terse routing-instance TEST-VRF 
Interface               Admin Link Proto    Local                 Remote
ge-0/0/1.0              up    up   inet     192.168.102.1/30

Specifying the routing-instance for the ping:

root@PE01# run ping routing-instance TEST-VRF 192.168.102.2 
PING 192.168.102.2 (192.168.102.2): 56 data bytes
64 bytes from 192.168.102.2: icmp_seq=0 ttl=64 time=2.159 ms
64 bytes from 192.168.102.2: icmp_seq=1 ttl=64 time=1.366 ms
^C
--- 192.168.102.2 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 1.366/1.762/2.159/0.396 ms

root@PE01# run show route 192.168.102.2

TEST-VRF.inet.0: 5 destinations, 8 routes (5 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

192.168.102.0/30 *[Direct/0] 00:14:34
 > via ge-0/0/1.0

Do you have a route for 6.1.1.1 in inet.0?

Hope this helps.

Cheers,

Ashvin

Thank you so much for your reply. it is vrf issue