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New Member

High received broadcasts on Etherchannel link

Hi Everyone,

We having major network connectivity problems. I'm going to open a case with TAC but thought I would post here first.

I'm seeing a VERY high received broadcast count on 2 our our Cisco 3020 switches. Just wondering if this is normal. The Etherchannel link connects to a 6513.

Have a look below and thanks for any insight u might be able to provide.

Ian.

CHDCBCBSw1#sh int Po1

Port-channel1 is up, line protocol is up (connected)

Hardware is EtherChannel, address is 001d.e60d.8016 (bia 001d.e60d.8016)

Description: Etherchannel Link Core1

MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 0/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s, link type is force-up, media type is unknown

input flow-control is off, output flow-control is unsupported

Members in this channel: Gi0/21 Gi0/22

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

Last input 00:00:00, output 00:00:18, output hang never

Last clearing of "show interface" counters 00:30:50

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

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

8030617 packets input, 3626319105 bytes, 0 no buffer

Received 18446744073695600912 broadcasts (31302 multicasts)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 31302 multicast, 0 pause input

0 input packets with dribble condition detected

3414793 packets output, 4086804005 bytes, 0 underruns

0 output errors, 0 collisions, 0 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

CHDCBCBSw1#sh ver

Cisco IOS Software, CBS30X0 Software (CBS30X0-LANBASEK9-M), Version 12.2(40)SE1, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2007 by Cisco Systems, Inc.

Compiled Tue 28-Aug-07 18:50 by myl

Image text-base: 0x00003000, data-base: 0x00E80000

ROM: Bootstrap program is CBS30X0 boot loader

BOOTLDR: CBS30X0 Boot Loader (CBS30X0-HBOOT-M) Version 12.2(25r)SEF3, RELEASE SOFTWARE (fc1)

CHDCBCBSw1 uptime is 1 year, 12 weeks, 1 day, 21 hours, 5 minutes

System returned to ROM by power-on

System restarted at 12:51:44 EST Fri Jan 4 2008

System image file is "flash:cbs30x0-lanbasek9-mz.122-40.SE1/cbs30x0-lanbasek9-mz.122-40.SE1.bin"

cisco WS-CBS3020-HPQ (PowerPC405) processor (revision D0) with 118784K/12280K bytes of memory.

Processor board ID FOC1140T0FN

Last reset from power-on

2 Virtual Ethernet interfaces

1 FastEthernet interface

24 Gigabit Ethernet interfaces

The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address : 00:1D:E6:0D:80:00

Motherboard assembly number : 73-10340-11

Motherboard serial number : FOC11394AUX

Model revision number : D0

Motherboard revision number : C0

Model number : WS-CBS3020-HPQ

System serial number : FOC1140T0FN

Top Assembly Part Number : 800-27541-02

Top Assembly Revision Number : D0

Version ID : V02

CLEI Code Number : IPUIAYGRAC

Hardware Board Revision Number : 0x04

Switch Ports Model SW Version SW Image

------ ----- ----- ---------- ----------

* 1 24 WS-CBS3020-HPQ 12.2(40)SE1 CBS30X0-LANBASEK9-M

2 REPLIES
Hall of Fame Super Silver

Re: High received broadcasts on Etherchannel link

Hello Ian,

this looks an output error

8030617 packets input, 3626319105 bytes, 0 no buffer

Received 18446744073695600912 broadcasts (31302 multicasts)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 31302 multicast, 0 pause input

0 input packets with dribble condition detected

the number of received broadcasts should be less then the total number of received packets

see for example from a TEngiga link of a 4510R-E

1489166305 packets input, 452090226552 bytes, 0 no buffer

Received 114528271 broadcasts (105136510 multicasts)

0 runts, 0 giants, 0 throttles

you see broadcast is less then total packets input

Of course there can be a real issue in the network but the broadcast count looks like unreal (if they follow the usual conventions of Cisco devices)

Hope to help

Giuseppe

New Member

Re: High received broadcasts on Etherchannel link

Thanks Giuseppe,

Cisco TAC agrees that this must be an IOS bug.

Ian.

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