From: wing_lam@jossynergy.com
Date: Thu Aug 05 2004 - 08:46:22 GMT-3
Hi Scott,
How many of failures would regard as high? I can see that the failure
numbers compare to the hit is still low in David's figure?
Do you mean "high" only for Large & Huge buffers in David's figure? If I
have the same case, how can I tune only these two buffers?
Thanks,
BBD
"Scott Morris"
<swm@emanon.com> To: "'David Duncon'" <david_ccie@hotmail.com>, <cchurch@netcogov.com>,
Sent by: <ccielab@groupstudy.com>
nobody@groupstudy cc:
.com Subject: RE: High Ignored Packet Errors
08/04/2004 08:48
PM
Please respond to
"Scott Morris"
Wowsa! That's a LOT of failures across the board there!!! I would
seriously take the time to create extra buffers on your router.
http://www.cisco.com/en/US/products/hw/routers/ps259/products_tech_note09186
a0080094e92.shtml#memory_overview
Buffers are used to break things apart and determine what to do with them
next. First, make sure you aren't process switching too much. (Fa0/1
seems
to have more cache misses) Using CEF may assist with this as well.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
JNCIP, et al.
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
David Duncon
Sent: Wednesday, August 04, 2004 1:19 AM
To: cchurch@netcogov.com; ccielab@groupstudy.com
Subject: RE: High Ignored Packet Errors
Thanks for your response , Chuck.
Here are my "sh buffers" and "sh run int fa0/0" outputs.
Router01#sh buffers
Buffer elements:
998 in free list (500 max allowed)
2727789782 hits, 0 misses, 500 created
Public buffer pools:
Small buffers, 104 bytes (total 50, permanent 50, peak 185 @ 2w4d):
45 in free list (20 min, 150 max allowed)
1376927835 hits, 17724 misses, 6045 trims, 6045 created
7429 failures (0 no memory)
Middle buffers, 600 bytes (total 25, permanent 25, peak 196 @ 7w0d):
23 in free list (10 min, 150 max allowed)
990639003 hits, 596896 misses, 1724 trims, 1724 created
493890 failures (0 no memory)
Big buffers, 1536 bytes (total 50, permanent 50, peak 77 @ 2w4d):
50 in free list (5 min, 150 max allowed)
12327055 hits, 483387 misses, 49 trims, 49 created
482393 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 10, permanent 10, peak 15 @ 2w4d):
10 in free list (0 min, 100 max allowed)
3798 hits, 481824 misses, 9 trims, 9 created
481824 failures (0 no memory)
Large buffers, 5024 bytes (total 1, permanent 0, peak 7 @ 2w4d):
1 in free list (0 min, 10 max allowed)
208 hits, 481722 misses, 3433 trims, 3434 created
481722 failures (0 no memory)
Huge buffers, 18024 bytes (total 1, permanent 0, peak 13 @ 7w0d):
1 in free list (0 min, 4 max allowed)
5384 hits, 481673 misses, 3473 trims, 3474 created
481651 failures (0 no memory)
Interface buffer pools:
CD2430 I/O buffers, 1536 bytes (total 0, permanent 0):
0 in free list (0 min, 0 max allowed)
0 hits, 0 fallbacks
Header pools:
Header buffers, 0 bytes (total 434, permanent 128, peak 434 @ 7w0d):
306 in free list (10 min, 512 max allowed)
39121 hits, 268 misses, 0 trims, 306 created
29 failures (0 no memory)
128 max cache size, 128 in cache
2684203733 hits in cache, 39025 misses in cache
Particle Clones:
1024 clones, 807290403 hits, 0 misses
Public particle pools:
F/S buffers, 256 bytes (total 384, permanent 384):
128 in free list (128 min, 1024 max allowed)
256 hits, 0 misses, 0 trims, 0 created
0 failures (0 no memory)
256 max cache size, 256 in cache
1602224646 hits in cache, 0 misses in cache Normal buffers, 1548 bytes
(total 512, permanent 512):
368 in free list (128 min, 1024 max allowed)
304304773 hits, 605 misses, 126 trims, 126 created
1 failures (0 no memory)
128 max cache size, 128 in cache
0 hits in cache, 0 misses in cache
Private particle pools:
FastEthernet0/0 buffers, 1548 bytes (total 192, permanent 192):
0 in free list (0 min, 192 max allowed)
192 hits, 0 fallbacks
192 max cache size, 128 in cache
1050384350 hits in cache, 1657494 misses in cache
FastEthernet0/1 buffers, 1548 bytes (total 192, permanent 192):
0 in free list (0 min, 192 max allowed)
192 hits, 0 fallbacks
192 max cache size, 128 in cache
1683380742 hits in cache, 282 misses in cache Serial0/0 buffers, 1548
bytes (total 32, permanent 32):
0 in free list (0 min, 32 max allowed)
32 hits, 0 fallbacks
32 max cache size, 16 in cache
2648556287 hits in cache, 302646710 misses in cache
Serial0/1 buffers, 1548 bytes (total 32, permanent 32):
0 in free list (0 min, 32 max allowed)
32 hits, 0 fallbacks
32 max cache size, 32 in cache
0 hits in cache, 0 misses in cache
............................................................................
.............................
Router01#sh run int fa0/0
Building configuration...
Current configuration : 90 bytes
!
interface FastEthernet0/0
no ip address
load-interval 30
speed 100
full-duplex
end
............................................................................
...........................
Router01#sh run int fa0/0.2
Building configuration...
Current configuration : 491 bytes
!
interface FastEthernet0/0.2
encapsulation dot1Q 2
ip address 10.3.1.2 255.255.254.0
standby 2 ip 10.3.1.1
standby 2 timers 1 4
standby 2 priority 110
standby 2 preempt
standby 2 track Serial0/0.200 40
Router01#sh run int fa0/0.3
Building configuration...
Current configuration : 321 bytes
!
interface FastEthernet0/0.3
encapsulation dot1Q 3
ip address 10.3.7.2 255.255.255.0
standby 2 ip 10.3.7.1
standby 3 timers 1 4
standby 3 priority 110
standby 3 preempt
standby 3 track Serial0/0.200 40
end
Router01#sh run int fa0/0.4
Building configuration...
Current configuration : 321 bytes
!
interface FastEthernet0/0.4
encapsulation dot1Q 4
ip address 10.3.2.2 255.255.255.0
standby 2 ip 10.3.2.1
standby 4 timers 1 4
standby 4 priority 110
standby 4 preempt
standby 4 track Serial0/0.200 40
end
David.
>From: "Church, Chuck" <cchurch@netcogov.com>
>To: "David Duncon" <david_ccie@hotmail.com>, <ccielab@groupstudy.com>
>Subject: RE: High Ignored Packet Errors
>Date: Tue, 3 Aug 2004 08:49:45 -0500
>
>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.
>
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>-----------------------------------------------------------------------
>-----
> NOTE: As of 8/1/2004 my email address has changed to
>cchurch@netcogov.com
>-----------------------------------------------------------------------
>-----
>
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