I am using a couple of Cisco 3550's (IOS 12.1(11))as backbone switches in a mixed vendor environment. I noticed one of the links connected to a Cisco 3550 switch in a work-group environment:
{backbn1}
|
GBlink
|
{backbn2}-----{100mb 801.q trunk}-----{wkgrp sw}
was seeing a large number of dropped packets. It was on the bb2 to wkgrpsw link at the wkgrp sw interface (about 20k in 5 hrs) as well as about 2k packets on the BB side of the link. Further investigation shows that they were dropped due to 'no dest'.
After looking at the bridging tables for both backbone switches and the wrkgrp switch, I find that the bridge tables on the backbone switch are showing entries that should have aged out, and have aged out on the wkgrp switch, but have not on the backbone switch.
I checked the mac table settings and all switches have aging enabled and set to 300 seconds. I cancelled and re-enabled aging on the tables, and I did a filtered packet capture on the link and no packets with the test mac were transmitted to the bb switches. I also verified that the entries were dynamic and there were no static or protected entries.
Anyone have any idea why these entries are refusing to age or why I'm seeing so many no-dest packets? Incidentally, I am not seeing any performance issues as a result, even though the discarded packets represent 2% of the total traffic on the interface.
thx,
ka
{backbn1}
|
GBlink
|
{backbn2}-----{100mb 801.q trunk}-----{wkgrp sw}
was seeing a large number of dropped packets. It was on the bb2 to wkgrpsw link at the wkgrp sw interface (about 20k in 5 hrs) as well as about 2k packets on the BB side of the link. Further investigation shows that they were dropped due to 'no dest'.
After looking at the bridging tables for both backbone switches and the wrkgrp switch, I find that the bridge tables on the backbone switch are showing entries that should have aged out, and have aged out on the wkgrp switch, but have not on the backbone switch.
I checked the mac table settings and all switches have aging enabled and set to 300 seconds. I cancelled and re-enabled aging on the tables, and I did a filtered packet capture on the link and no packets with the test mac were transmitted to the bb switches. I also verified that the entries were dynamic and there were no static or protected entries.
Anyone have any idea why these entries are refusing to age or why I'm seeing so many no-dest packets? Incidentally, I am not seeing any performance issues as a result, even though the discarded packets represent 2% of the total traffic on the interface.
thx,
ka