Re: [c-nsp] Active Portchannel - Adding new member fails

Thu, 28 Jul 2011 15:35:11 -0700 

Thanks John - I resolved the problem last night during outage window.
What worked was setting eth int to default (default interface fastEthernet 0/x) and then re-adding the original eth port config...working now with both eth ints as members of portchan. 

Thanks again to all who responded.


Quoting John Gill <[email protected]>:
Sorry, I believe the mailer or my mail was delayed a bit and I didn't see the previous response. 

This is bad behavior, your config looks good. I suspect it could be this bug:
CSCsd11234    ports fail to bundle when nonegotiate is configured

What version of software are you running?
Release note mentions this (found on 4500, but applicable to desktop switch code too): If a physical interface is configured in shutdown mode, then configured with the same configuration including "switchport nonegotiate," when it is later enabled by the no shutdown command, it can not join the bundle and the following error message displays:
%EC-5-CANNOT_BUNDLE2: Gi3/16 is not compatible with Po1and will be suspended (trunk mode of Gi3/16 is dynamic, Po1 is trunk)
The following configuration sequence will prevent interface g3/16 from joining the bundle: 

int g3/16
shut
switchport mode trunk
switchport nonegotiate
channel-group 1 mode on


int po1
switchport trunk enacp dot1q
switchport mode trunk
switchport nonegotiate

int g3/16
 no shut
Workaround: Do NOT configure the channel-port with the same configuration while all physical ports are still in shutdown mode. Instead, issue the unshutdown command on the physical ports to carry over the first unshutdown to the channel port. (CSCsd11234) 

Regards,
John Gill
cisco


On 7/27/11 6:05 PM, [email protected] wrote:

Quoting John Gill <[email protected]>:


Can you check the config on port-channel 2? perhaps there is
difference between port trunk config of 0/20 and the channel trunk
config.



Thanks for the response - Already just sent that info, but here it is
again:

interface Port-channel2
description FEC_TO_ESW02_BNE
switchport trunk allowed vlan
1,11,12,14,30,35,68,99,100,103,104,106-108,112
switchport trunk allowed vlan add
113,115,120-123,129,132-136,138,156,158,160
switchport trunk allowed vlan add
206,289,311,312,340,345,377-396,398,399,402
switchport trunk allowed vlan add
422,444,472,473,475,478-488,492,493,497,498
switchport trunk allowed vlan add
500,546,590,591,700,801-806,808,809,811-815
switchport trunk allowed vlan add
865,866,868,869,957,970,973,974,978,987,1829
switchport trunk allowed vlan add 2501,2506,2516,2518-2525
switchport mode trunk
switchport nonegotiate

#sh interface port-channel 2 switchport Name: Po2
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none


And as stated, the portchan is currently up and running with FA0/21

#sh int port-channel 2 Port-channel2 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 0017.5af5.6695 (bia 0017.5af5.6695)
Description: FEC_TO_ESW02_BNE
MTU 1530 bytes, BW 100000 Kbit, DLY 1000 usec, reliability 255/255,
txload 87/255, rxload 116/255
Encapsulation ARPA, loopback not set
Full-duplex, 100Mb/s, media type is unknown media type
input flow-control is off, output flow-control is off
Members in this channel: Fa0/21 ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 09:28:14, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo




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