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Input Queue Drops on MSFC2

sknorr
Level 1
Level 1

I am troubleshooting a problem with very little success. I have a VLAN located on a MSFC2. In smalls burst about every so often I see the input queue drops jump quite a bit. Any other time the queue is 0/75. I did some show commands but I'm affraid that I need some help looking through them. Below is an out put of some commands. I don't know if the cause is broadcast traffic or maybe I don't have MLS set up right. Normally we don't have a lot of traffic on our network, and I don't see any signs of bursty traffic however I keep getting alerts about my input queue on a Few of my VLANS. Please if you have any idea HELP!!!

Notice the bad hop count under the sho ip traffic command. Does this mean anything? Also check out UDP stats.

MSFC#sho int vlan21

Vlan21 is up, line protocol is up

Hardware is Cat6k RP Virtual Ethernet, address is 00d0.038b.77fc (bia 00d0.038

b.77fc)

Description: HSRP-AN1W-1-User-Community

Internet address is 172.**.**.**/24

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, output never, output hang never

Last clearing of "show interface" counters 02:02:01

Queueing strategy: fifo

Output queue 0/40, 0 drops; input queue 0/75, 136 drops

5 minute input rate 0 bits/sec, 1 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

10020 packets input, 869402 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

2812 packets output, 203949 bytes, 0 underruns

0 output errors, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

MSFC#

MSFC#

MSFC#

MSFC#sho ip traffic

IP statistics:

Rcvd: 112580562 total, 102170945 local destination

0 format errors, 0 checksum errors, 180710 bad hop count

385 unknown protocol, 0 not a gateway

0 security failures, 0 bad options, 172742 with options

Opts: 167 end, 0 nop, 0 basic security, 110 loose source route

0 timestamp, 0 extended security, 57 record route

0 stream ID, 0 strict source route, 172575 alert, 0 cipso

0 other

Frags: 0 reassembled, 0 timeouts, 0 couldn't reassemble

0 fragmented, 0 couldn't fragment

Bcast: 19331932 received, 11617 sent

Mcast: 79170263 received, 76008494 sent

Sent: 80082399 generated, 7403969 forwarded

Drop: 3661804 encapsulation failed, 0 unresolved, 0 no adjacency

12637 no route, 0 unicast RPF, 0 forced drop

ICMP statistics:

Rcvd: 0 format errors, 0 checksum errors, 1 redirects, 4603 unreachable

1297725 echo, 55 echo reply, 0 mask requests, 0 mask replies, 0 quench

0 parameter, 0 timestamp, 0 info request, 0 other

203 irdp solicitations, 0 irdp advertisements

Sent: 0 redirects, 20373 unreachable, 110 echo, 1297725 echo reply

0 mask requests, 0 mask replies, 0 quench, 0 timestamp

0 info reply, 67 time exceeded, 0 parameter problem

0 irdp solicitations, 0 irdp advertisements

UDP statistics:

Rcvd: 75011899 total, 2 checksum errors, 19345405 no port

Sent: 53191410 total, 24114 forwarded broadcasts

TCP statistics:

Rcvd: 36520 total, 0 checksum errors, 154 no port

Sent: 30264 total

Probe statistics:

Rcvd: 0 address requests, 0 address replies

0 proxy name requests, 0 where-is requests, 0 other

Sent: 0 address requests, 0 address replies (0 proxy)

0 proxy name replies, 0 where-is replies

PIMv2 statistics: Sent/Received

Total: 0/0, 0 checksum errors, 0 format errors

Registers: 0/0, Register Stops: 0/0, Hellos: 0/0

Join/Prunes: 0/0, Asserts: 0/0, grafts: 0/0

Bootstraps: 0/0, Candidate_RP_Advertisements: 0/0

IGMP statistics: Sent/Received

Total: 0/0, Format errors: 0/0, Checksum errors: 0/0

Host Queries: 0/0, Host Reports: 0/0, Host Leaves: 0/0

DVMRP: 0/0, PIM: 0/0

EGP statistics:

Rcvd: 0 total, 0 format errors, 0 checksum errors, 0 no listener

Sent: 0 total

IGRP statistics:

Rcvd: 0 total, 0 checksum errors

Sent: 0 total

OSPF statistics:

Rcvd: 27013994 total, 0 checksum errors

24576598 hello, 169 database desc, 9 link state req

1183010 link state updates, 35510 link state acks

Sent: 25542519 total

IP-IGRP2 statistics:

Rcvd: 0 total

Sent: 0 total

ARP statistics:

Rcvd: 24242764 requests, 251642 replies, 22 reverse, 0 other

Sent: 2830794 requests, 13733586 replies (13703577 proxy), 0 reverse

MSFC#

2 Replies 2

rfroom
Cisco Employee
Cisco Employee

Is this a Sup1 or Sup2?? The MSFC only handles software switched packets, most packets are intended to be switched in hardware ASICs on the Supervisor. Therefore, something is causing the MSFC to get a burst of packets. What is configured under the VLAN 21 interface besides the IP address? Are you doing HSRP? Have you check to see if this may be related to Asymmetric Routing?

By default, MLS will run on the Sup1/MSFC2. Unless you have changed the config, it should be functioning correctly.

HSRP: http://www.cisco.com/warp/customer/473/62.shtml

It's a MSFC2. Running OSPF

Here's the config.

interface Vlan21

description HSRP-AN1W-1-User-Community

ip address 172.**.*.* 255.255.255.0

ip broadcast-address 172.**.**.255

ip helper-address 172.**.**.**

ip helper-address 172.**.**.**

no ip redirects

standby 1 timers 5 15

standby 1 priority 100 preempt

standby 1 ip 172.**.**.**

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