06-29-2011 01:30 PM - edited 03-07-2019 01:01 AM
Hi,
One of the server hosted at Site-A , not able to connect the application which is hosted at Site-B Server , there is no firewall in between.Server IP's are pingable from both the end. See the below trace route from SITE-A to SITE-B and vice versa. based on below trace result we can see that there is some asymmetric route beween these two sites.
Does asymmetric routing can affect application operation?
Please advise ?
Core-SWITCH-SITE-A#traceroute 50.35.3.220 (Server-a)
1 162.28.0.9 4 msec 0 msec 0 msec
2 50.133.51.176 4 msec 0 msec 4 msec
3 50.133.51.25 44 msec 48 msec 44 msec
4 50.129.2.246 48 msec 48 msec 48 msec
5 191.168.201.30 144 msec 140 msec 144 msec
6 50.35.3.220 140 msec 140 msec 144 msec
Core-SWITCH-SITE-B#traceroute 162.18.17.28 (Server-b)
1 50.135.2.3 152 msec 152 msec 156 msec
2 50.133.51.22 136 msec 136 msec 140 msec
3 50.133.50.2 136 msec 156 msec 144 msec
4 50.133.251.175 140 msec 140 msec 140 msec
5 162.28.0.8 140 msec 144 msec 140 msec
6 162.28.17.28 148 msec 156 msec 152 msec
Regard,
06-29-2011 02:51 PM
Hi Niham,
Asymmetric routing occurs when transmit and receive packets follow different paths between a host and the peer with which it communicates. In your scenario, if you see a different path when you traceroute to server B from server A and vice versa, it indicates asymmetric routing .
Asymmetric routing can lead to issues like unicast flooding ,missing MLS entries, latency and drops. The below link provides a detailed explanation about asymmetric routing:
This can be tackled by applying the following:
mac-address-table aging-time seconds [vlan vlan_id]
Change the MAC aging time and ARP timeout to the same timeout value.
HTH,
Chaitra
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