2960 Ethernet interfaces going down
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From: Sam Wilson on 25 Nov 2008 15:52 In article <slrngion68.6qq.joliver(a)ns.sdsitehosting.net>, John Oliver <joliver(a)john-oliver.net> wrote: > On Tue, 25 Nov 2008 19:46:22 +0000, Sam Wilson wrote: > > In article <slrngiogof.4jg.joliver(a)ns.sdsitehosting.net>, > > John Oliver <joliver(a)john-oliver.net> wrote: > > > >> In the past week or two, I've hada three or four Gigabit Ethernet > >> interfaces on about as many 2960s go down and say "err-diabled". > >> : > >> : > >> However, no errors are counted. How can I start to figure out what is > >> happening and why? > > > > Start with "sh errdis ?" and look at the options. I don't have a 2960 > > to hand but the 3550 I just checked offers detect, flap-values and > > recovery. We have recovery enabled and "sh errdis rec" shows (would > > show) a list of interfaces that would be reenabled at the next timeout. > > I don't know what you'll see. > > SES-Distribution#sh errdisable recovery > SES-Distribution#sh errdisable detect > SES-Distribution#sh errdisable flap-values > [nothing helpful] OK, try 'sh int status err-disabled' if your IOS supports that. Sam
From: Stephen on 25 Nov 2008 17:11 On Tue, 25 Nov 2008 19:25:19 +0100 (CET), John Oliver <joliver(a)john-oliver.net> wrote: >In the past week or two, I've hada three or four Gigabit Ethernet >interfaces on about as many 2960s go down and say "err-diabled". One >doesn't even have anything attached to it! try the various "sh err-dis" subcommands and it should be able to tell you what is going on. you can also set the ports (or entire switch) to auto recover after a time, and AFAIR for specific types of error. > >SES-Distribution#sh int Gi0/4 >GigabitEthernet0/4 is down, line protocol is down (err-disabled) > Hardware is Gigabit Ethernet, address is 0022.be29.eb04 (bia >0022.be29.eb04) > MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, > reliability 255/255, txload 1/255, rxload 1/255 > Encapsulation ARPA, loopback not set > Keepalive set (10 sec) > Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX > input flow-control is off, output flow-control is unsupported > ARP type: ARPA, ARP Timeout 04:00:00 > Last input 1w5d, output 1w5d, output hang never > Last clearing of "show interface" counters never > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: >15298 > Queueing strategy: fifo > Output queue: 0/40 (size/max) > 5 minute input rate 0 bits/sec, 0 packets/sec > 5 minute output rate 0 bits/sec, 0 packets/sec > 18322903 packets input, 20805679728 bytes, 0 no buffer > Received 18297621 broadcasts (0 multicasts) > 0 runts, 0 giants, 0 throttles > 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored > 0 watchdog, 15121276 multicast, 0 pause input > 0 input packets with dribble condition detected > 166633 packets output, 226858846 bytes, 0 underruns > 0 output errors, 0 collisions, 1 interface resets > 0 babbles, 0 late collision, 0 deferred > 0 lost carrier, 0 no carrier, 0 PAUSE output > 0 output buffer failures, 0 output buffers swapped out > > >However, no errors are counted. How can I start to figure out what is >happening and why? -- Regards stephen_hope(a)xyzworld.com - replace xyz with ntl
From: John Oliver on 25 Nov 2008 19:48 On Tue, 25 Nov 2008 20:52:09 +0000, Sam Wilson wrote: > OK, try 'sh int status err-disabled' if your IOS supports that. SES-Distribution#sh int status err-disabled Port Name Status Reason Err-disabled Vlans Gi0/4 err-disabled loopback And, of course, that interface is down again. I'm shutting it and then no-shutting it. But, apparently, it's just going to go down again. -- * John Oliver http://www.john-oliver.net/ *
From: News Reader on 25 Nov 2008 19:57 John Oliver wrote: > On Tue, 25 Nov 2008 20:52:09 +0000, Sam Wilson wrote: >> OK, try 'sh int status err-disabled' if your IOS supports that. > > SES-Distribution#sh int status err-disabled > > Port Name Status Reason > Err-disabled Vlans > Gi0/4 err-disabled loopback > > > And, of course, that interface is down again. I'm shutting it and then > no-shutting it. But, apparently, it's just going to go down again. > Your command output is conveying a reason - "loopback". A simple Google search (err-disabled loopback) returned the following link (among others): http://ciscosystems.com/application/pdf/paws/69980/errdisable_recovery.pdf Do a simple search within the document for the term "Loopback error" to find the information desired. Best Regards, News Reader
From: Sam Wilson on 26 Nov 2008 11:59
In article <4a1Xk.94$Yg.73(a)read2.cgocable.net>, News Reader <user(a)domain.null> wrote: > John Oliver wrote: > > On Tue, 25 Nov 2008 20:52:09 +0000, Sam Wilson wrote: > >> OK, try 'sh int status err-disabled' if your IOS supports that. > > > > SES-Distribution#sh int status err-disabled > > > > Port Name Status Reason > > Err-disabled Vlans > > Gi0/4 err-disabled loopback > > > > > > And, of course, that interface is down again. I'm shutting it and then > > no-shutting it. But, apparently, it's just going to go down again. So check up on the errdisable recovery command(s). BUT... > Your command output is conveying a reason - "loopback". > > A simple Google search (err-disabled loopback) returned the following > link (among others): > > http://ciscosystems.com/application/pdf/paws/69980/errdisable_recovery.pdf > > Do a simple search within the document for the term "Loopback error" to > find the information desired. .... what he said! Find out what the problem is (you have a loop in your network somewhere) and fix it and then the port will stop going down. Sam |