03-12-2003 04:12 AM - edited 03-02-2019 05:48 AM
I'm having performance problems with a 2020 router. It's connect to the Internet backbone with only 2Mbps HDLC that is shared with many costomers.
The CPU is 99% busy even when the traffic is less than 2Mbps.
The fastethernet statistics says:
Output queue 0/40, 0 drops; input queue 76/75, 2152321 drops
5 minute input rate 934000 bits/sec, 1330 packets/sec
5 minute output rate 2250000 bits/sec, 1314 packets/sec
CPU utilization for five seconds: 99%/53%; one minute: 97%; five minutes: 95%
Is the input queue is very high ? (76/75) so it drop packets ?
What can I do, add memory ?
Thanks.
Solved! Go to Solution.
03-12-2003 05:29 AM
Hard to tell.....what is your queuing strategy?
May be give a "sh ip int FastEthernet 0/1" along.
Ciao
Roger
03-13-2003 06:21 AM
rt2-26(config)#ip cef ==> press enter without any parameter
You do not have to give an aditional parameter. Just press enter after the ip cef.
If you do a ? and in the list ist also a
Ciao
Roger
03-12-2003 04:19 AM
Do you have any filtering (acl's) or policy routing in place?
Regards
Roger
03-12-2003 04:35 AM
There is no policy routing. Some acl's is configured but applied only in serial interfaces.
I've already tried to remove all acls, but the problems continues.
...
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.2(5d), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Sat 02-Feb-02 03:36 by kellythw
Image text-base: 0x80008088, data-base: 0x80989870
ROM: System Bootstrap, Version 12.2(10r)1, RELEASE SOFTWARE (fc1)
rt2-26 uptime is 2 weeks, 2 hours, 35 minutes
System returned to ROM by power-on
System image file is "flash:c2600-i-mz.122-5d.bin"
cisco 2620 (MPC860) processor (revision 0x00) with 28672K/4096K bytes of memory.
Processor board ID JAD0643028C (2215344024)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
1 FastEthernet/IEEE 802.3 interface(s)
2 Serial(sync/async) network interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read/Write)
Configuration register is 0x2102
03-12-2003 05:29 AM
Hard to tell.....what is your queuing strategy?
May be give a "sh ip int FastEthernet 0/1" along.
Ciao
Roger
03-12-2003 06:08 AM
FastEthernet0/0 is up, line protocol is up
Internet address is 200.241.84.17/24
Broadcast address is 255.255.255.255
Address determined by non-volatile memory
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Multicast reserved groups joined: 224.0.0.9
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP fast switching on the same interface is disabled
IP Flow switching is disabled
IP Feature Fast switching turbo vector
IP multicast fast switching is enabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
RTP/IP header compression is disabled
Probe proxy name replies are disabled
Policy routing is disabled
Network address translation is disabled
WCCP Redirect outbound is disabled
WCCP Redirect inbound is disabled
WCCP Redirect exclude is disabled
BGP Policy Mapping is disabled
03-12-2003 06:24 AM
I saw with that command that ip fast-switching on same interface was disabled. When I enabled it, the performance became so much better.
Now it is only 50% busy with 2200 packets/sec.
Thanks a lot.
03-12-2003 07:26 AM
Hello again
Seams that you problem is partly solved....i still think 50 % ist quite busy.
I actually wanted to see the output of "sh int FastEthernet 0/1" to see the
queuing strategy. Somehow i wrote you the wrong command above.
So if like you can post also the output of this command.
Ciao
Roger
03-12-2003 09:24 AM
No problems.
Thanks.
FastEthernet0/0 is up, line protocol is up
Internet address is xxx.xxx.xxx.xxx/24
Broadcast address is 255.255.255.255
Address determined by non-volatile memory
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Multicast reserved groups joined: 224.0.0.9
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP fast switching on the same interface is enabled
IP Flow switching is disabled
IP Feature Fast switching turbo vector
IP multicast fast switching is enabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
RTP/IP header compression is disabled
Probe proxy name replies are disabled
Policy routing is disabled
Network address translation is disabled
WCCP Redirect outbound is disabled
WCCP Redirect inbound is disabled
WCCP Redirect exclude is disabled
BGP Policy Mapping is disabled
03-12-2003 11:17 AM
I meant the command without the ip ==> sh int FastEthernet0/1
You posted again the one with the ip ==> sh ip int FastEthenet0/1
Ciao
Roger
03-12-2003 11:33 AM
Excuse me.
------------
FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is 000b.46d7.9100 (bia 000b.46d7.9100)
Internet address is xxx.xxx.xxx.xxx/24
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 254/255, txload 5/255, rxload 3/255
Encapsulation ARPA, 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 never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 2/75, 2395567 drops
5 minute input rate 1441000 bits/sec, 2287 packets/sec
5 minute output rate 2312000 bits/sec, 2199 packets/sec
441036424 packets input, 331034859 bytes
Received 3945572 broadcasts, 0 runts, 0 giants, 0 throttles
749153 input errors, 749153 CRC, 376244 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
454137314 packets output, 1164475328 bytes, 0 underruns
0 output errors, 0 collisions, 4 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
03-12-2003 07:50 PM
Is CEF support on that device? My 2621's support it with IOS version 12.2(6r). Could lower the CPU usage even more...
03-13-2003 04:45 AM
Is the command something like that ?
rt2-26(config-if)#ip cef accounting non-recursive ?
external Count input traffic in non-recursive external bin
internal Count input traffic in non-recursive internal bin
Thanks
03-13-2003 05:02 AM
rt2-26(config-if)#ip route-cache cef
% Global CEF is not enabled
I think it is not supported :(
03-13-2003 12:59 AM
Hi
Thanks for that output. You have a high counter of input errors and crc which provide a count of any errors that occured while trying to receive packets on this interface.
So i guess you still have a problem on the LAN Segment with other components.
The rest looks o.k for me. You probably could also get an optimisation if you
would enable cef.
Ciao
Roger
03-13-2003 04:29 AM
Roger,
The input errors was due to force 100Mbps parameter that I set. I changed it to auto, and now there is no more input errors.
The ip cef command needs much more parameters. I dont know nothing about cef. Could you suggest what parameters should I use ?
Thanks a lot.
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