hsrp traceroute issue

[jeevak mukadam]

           

Hello,

I am working on following topology in gns3.

   When i try to traceroute from r3 to r5 i am getting following result

R3#traceroute 192.168.1.50

Type escape sequence to abort.
Tracing the route to 192.168.1.50

1 192.168.1.50 16 msec *  8 msec

Issue: i am not getting hsrp gateway ip of vlan 1 as a result i am not able identfy flow of traffic from r3 to r5

[Adrian Coto]

Hello Jeevak

This example may be a bit confussing because routers are doing L2 forwarding and L3 forwarding at the same time

Remember, L2Forwarding is MAC Address based. L3 Forwarding is IP Address based.

From your schematic, all Vlan 1 interfaces share the same L2 segment.

As R3 and R5 are on the same segment R3 will not send the packet to gateway to reach R5.

R2 will forward the packet, but in L2. It will not interact at L3, and you will not see it in the traceroute.

Regards,

Adrian

[blau grana]

Hello Jeevak,

As Adrian said, you are sending pings in same L3 domain, so R3 send ARP request, R5 answer with ARP reply and ping is switched to R5. R5 is first and only one L3 hop.

 i am not able identfy flow of traffic from r3 to r5

If you want determine path to host via traceroute which is on different subnet, ping has to traverse through L3 gateway device (HSRP active device).

In this case you will see response from physical interface IP address (not virtual IP) so you will be able to determine which path packets take.

Best Regards

Please rate all helpful posts and close solved questions

[jeevak mukadam]

Thank you balue and Adrian i resolved it successfully.