We are encountering some very strange behavior on POS interfaces seated inside eFlexwans on a 7613 with SUP720. On a 7613 running 12.2(18)SXE6b we do not see any of this strangeness. On a 7613 running 12.2(18)SXF11 - we do.
The strangeness is hard to define. It appeared first when we tried to bring up a backup STM-1 circuit which hadn't been used in a year and would only pass about 700kbps. We blamed the carrier but now suspect a subtle bug in IOS. Other POS interfaces also show pkt loss, whereas one other POS interface - which happened to be the only live one with constant moving traffic does not show any strangeness. When doing ping from the router to the other side of the interface, we see deterministic pkt loss like this: POS3/0/1 Sending 10000, 100-byte ICMP Echos to xxx.139.237.2, timeout is 2 seconds: !!!!!!!!!!!!!.!!!!!!!!!!!!!!.!!!!!!!!!!!!!.!!!!!!!!!!!!!!.!!!!!!!!!!!! !!!!!.!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!.!!!!!!!!!!!!!.!!!!!!!!!!!!!!.!!!! !!!!!!!!!.!!!!!!!!!!!!!!.!!!!!!!!!!!!!!.!!!!!!!!!!!!!!.!!!!!!!!!!!!!.! The drop on this link is periodic, it's not random, every 14th packet is dropped. We have no rate limiting enabled. Depending on packet size of ping - we get different deterministic results. After playing with the bad interface for a while (shut, no shut, sdh parms, moved to another free POS port, SDH tester equipment, loopbacks, etc.), it suddenly came alive and no longer lost any packets. Has anyone encountered anything similar to this? Otherwise, this is gonna be hell to debug with TAC. Thanks, Hank _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
