Issue with exact 50% icmp ping loss

[Raj_Kam]

Hi Gens,

facing issue with Extreme switches X460 .
As when i am pinging the other node onm vip from the extreme l3 switch

getting the ping response with every alternate ping loss like below
64 bytes from x.x.x.x: icmp_seq=0 ttl=64 time=1.195 ms
64 bytes from x.x.x.x: icmp_seq=2 ttl=64 time=0.963 ms
64 bytes from x.x.x.x: icmp_seq=4 ttl=64 time=1.237 ms
64 bytes from x.x.x.x: icmp_seq=6 ttl=64 time=1.030 ms

and the seq are even for one switch and with other it is odd like below.

64 bytes from x.x.x.x: icmp_seq=1 ttl=64 time=1.105 ms
64 bytes from x.x.x.x: icmp_seq=3 ttl=64 time=0.863 ms
64 bytes from x.x.x.x: icmp_seq=5 ttl=64 time=1.155 ms
64 bytes from x.x.x.x: icmp_seq=7 ttl=64 time=1.475ms

is this the issue with the switch or it is the expected behavior.

help me how to troubleshoot it .

Regards
Raj

[Henrique]

Correct, I would check the routing on each hop as well as LAG/VRRP configuration.

[Raj_Kam]

need to check the routing ?

[Henrique]

Even with those 2 OSPF routes, the switch is only using the route through route_1_1. You can confirm that based on the flag "f" that means "provided to FIB".

The second route is active but not being used.

It seems to be related to asymmetric routing.

I would check from point A to B and B to A if that communication is using the same path.

[Raj_Kam]

and traceroute to VIP from SWITCH

# traceroute 10.196.x.xtraceroute to 10.196.X.X, 30 hops max
1 * * *
2 10.196.x.x 3 ms * 2 ms

--- Packet Response/Error Flags ---
(*) No response, (!N) ICMP network unreachable, (!H) ICMP host unreachable,
(!P) ICMP protocol unreachable, (!F) ICMP fragmentation needed,
(!S) ICMP source route failed, (!u) Transmit error, network unreachable,
(!f) Transmit error, fragmentation needed, (!t) General transmit error
# traceroute 10.196.x.x
traceroute to 10.196.X.X, 30 hops max
1 * * *
2 *
2 10.196.x.x 2 ms *

--- Packet Response/Error Flags ---
(*) No response, (!N) ICMP network unreachable, (!H) ICMP host unreachable,
(!P) ICMP protocol unreachable, (!F) ICMP fragmentation needed,
(!S) ICMP source route failed, (!u) Transmit error, network unreachable,
(!f) Transmit error, fragmentation needed, (!t) General transmit error