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Runt Errors on EtherChannel (fibre) on a Cat6509 - Cat6509 link

We have a pair of cat6509 switches connected together via fibre (ZX GBIC) Gigabit links. Gig port 1/1 & 1/2 on sw01 (6509)

is connected to Gig port 1/1 & 1/2 on sw02 (6509). They are Dot1Q trunked and Etherchannelled.

Sw01 config:

module 1 : 2-port 1000BaseX Supervisor

set port name 1/1 xxx-xxx-SW-02 1/1

set port name 1/2 xxx-xxx-SW-02 1/2

set udld aggressive-mode enable 1/1-2

clear trunk 1/1 11-15,17

set trunk 1/1 on dot1q 1-10,16,18-1005,1025-4094

clear trunk 1/2 11-15,17

set trunk 1/2 on dot1q 1-10,16,18-1005,1025-4094

set port qos 1/1-2 trust trust-dscp

set port channel 1/1-2 mode on

end

Sw02 config:

module 1 : 2-port 1000BaseX Supervisor

set module name 1

set port name 1/1 xxx-xxx-SW-01 1/1

set port name 1/2 xxx-xxx-SW-01 1/2

set udld aggressive-mode enable 1/1-2

clear trunk 1/1 11-14,16,18

set trunk 1/1 on dot1q 1-10,15,17,19-1005,1025-4094

clear trunk 1/2 11-14,16,18

set trunk 1/2 on dot1q 1-10,15,17,19-1005,1025-4094

set port qos 1/1-2 trust trust-dscp

set port channel 1/1-2 mode on

end

As can be seen by the output below we are experiencing incrementing runt errors on Sw01 only on Gig port 1/1 (Gig port on WS-X6K-SUP1A-2GE). No errors are seen on

Gig port 1/2 of sW01 or on gig ports 1/1 & 1/2 of sw02.

So far we have upgraded swapped both ZX GBICs on Sw01. Each time one of the Gig ports was taken down to carry out a swap out of the ZX GBIC,

network connectivity was maintained as the traffic was forced to traverse the remaining link in the Etherchannel. When the previoulsy

erroring port (runts) was brought back up and checked for errors, the port would be found to be error free. But when the second Gig port (previously error free) in the Etherchannel was

checked for errors it was now found to be experiencing runt errors. This behaviour has been found to consistent when disabling and renabling a port in the Etherchannel. i.e. the runt errors

move to the other Gig port.

So far we have swapped both ZX GBICs in Sw01, the Supervisor module and MSFC2 card but the runt errors remain. We will be checking the fibre later today and swapping the ZX GBICs on Sw02

although I beleive the symptoms and migratory nature and behaviour of the runt errors as described above would seem to indicate more of a software issue.

Does anyone have any ideas or experienced a similar fault. Any help would be greatly appreciated.

Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants

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

1/1 0 0 0 0 0 2911

0

Port Last-Time-Cleared

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

1/1 Sat Jun 24 2006, 04:11:43

Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants

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

1/2 0 0 0 0 0 0

-

Port Last-Time-Cleared

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

1/2 Sat Jun 24 2006, 04:11:43

3 REPLIES
Anonymous
N/A

Re: Runt Errors on EtherChannel (fibre) on a Cat6509 - Cat6509 l

Re: Runt Errors on EtherChannel (fibre) on a Cat6509 - Cat6509 l

Hi

U have cleared the vlans differently on the switches.see that u clear the same vlans at both the ends.

clear trunk 1/1 11-15,17

set trunk 1/1 on dot1q 1-10,16,18-1005,1025-4094

clear trunk 1/2 11-15,17

clear trunk 1/1 11-14,16,18

set trunk 1/1 on dot1q 1-10,15,17,19-1005,1025-4094

clear trunk 1/2 11-14,16,18

set trunk 1/2 on dot1q 1-10,15,17,19-1005,1025-4094

Try to specify the same set of vlans that need to be cleared.

Thanks

Mahmood

New Member

Re: Runt Errors on EtherChannel (fibre) on a Cat6509 - Cat6509 l

What is the version of code? show ver and a show mod would be good, I think I remember a bug with some gig ports.

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