From: Church, Chuck (cchurch@netcogov.com)
Date: Tue Aug 03 2004 - 10:49:45 GMT-3
From CCO:
"Ignored Packets
router#show interfaces ethernet 0
Ethernet0/0 is up, line protocol is up
..
21 input errors, 0 CRC, 0 frame, 0 overrun, 21 ignored
Packets are ignored if there are no free buffers to accept the new
packet. This can happen if the router is overloaded with traffic, but
can also happen if the interface is faulty. If "ignores" are present on
all interfaces, then the router is probably overloaded with traffic, or
doesn't have sufficient free buffers in the pool that match the maximum
transmission unit (MTU) on interfaces. In the latter case, an increment
of the ignored counter is followed by an increment of the no buffer
counter:"
What does 'sh buf' tell you? And what's your config look like for this
ethernet interface?
Chuck Church
Wam!Net Government Services - D&I Team
Lead Design Engineer
CCIE #8776, MCNE, MCSE
1210 N. Parker Rd.
Greenville, SC 29609
Office: 864-335-9473
Cell: 703-819-3495
cchurch@wamnetgov.com
PGP key:
http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.
com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
David Duncon
Sent: Tuesday, August 03, 2004 9:18 AM
To: ccielab@groupstudy.com
Subject: High Ignored Packet Errors
Hi Group,
One of our multi vlan Spoke router is displaying unusually large number
of *ignored packets*. There are two things happening here, in the
absence of a
L3 switch, we are using this router as a Router on a Stick config and
making this Router to do the job of intervlan routing as well. Secondly
this site do have some historical cabling issues and at some stage my
syslog box used to get bombarded by *late collisions* errors from
Router's Ethernet int. But since we replaced the longer Cat 6 fly lead
to with a shorter one, understandably the late collisions have
disappeared.
But lately we are running in to this sort of large number of "ignored
packets".
Can any one drill further on this aspect and advise me on the following.
- What are the likely causes?
- How can I eliminate them ?
- What number is acceptable/expected ?
Router1#sh int fa0/0
FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is 000b.beae.ac00 (bia 000b.beae.ac00)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 09:09:40
Input queue: 0/75/147/0 (size/max/drops/flushes); Total output drops:
0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 82000 bits/sec, 131 packets/sec
30 second output rate 284000 bits/sec, 267 packets/sec
11182341 packets input, 2002862830 bytes
Received 566627 broadcasts, 0 runts, 0 giants, 0 throttles
42680467 input errors, 0 CRC, 0 frame, 0 overrun, 42680467 ignored
????????????????????
0 watchdog
0 input packets with dribble condition detected
14471291 packets output, 3377013099 bytes, 0 underruns
0 output errors, 0 collisions, 5 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Thanks,
David.
This archive was generated by hypermail 2.1.4 : Fri Sep 03 2004 - 07:02:31 GMT-3