From: Mujica, Raul - (Per) (raul.mujica@attla.com)
Date: Sun Nov 30 2003 - 11:44:10 GMT-3
Juan:
You are right !!
I have tried allowing vlan 1 and everything works fine, but when I remove
vlan 1 the port-channel went down.
interface range FastEthernet0/23-24
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
udld enable
channel-group 1 mode desi
Switch#sh int po1
Port-channel1 is up, line protocol is up
Switch(config)#int po1
Switch(config-if)#switchport trunk allowed vlan excep 1
Switch(config-if)#shu
Switch(config-if)#
07:58:05: PAgP: Fa0/23 is going Down
07:58:05: PAgP: Fa0/23 action_a1 is entered
07:58:05: PAgP: Fa0/24 is going Down
07:58:05: PAgP: Fa0/24 action_a1 is entered
07:58:06: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1,
changed state to down
07:58:07: %LINK-5-CHANGED: Interface FastEthernet0/23, changed state to
administratively down
07:58:07: %LINK-5-CHANGED: Interface FastEthernet0/24, changed state to
administratively down
07:58:07: %LINK-5-CHANGED: Interface Port-channel1, changed state to
administratively down
07:58:08: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23,
changed state to down
07:58:08: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24,
changed state to down
Switch(config-if)#
Switch(config-if)#no shu
Switch(config-if)#
07:58:16: %LINK-3-UPDOWN: Interface Port-channel1, changed state to down
07:58:16: %LINK-3-UPDOWN: Interface FastEthernet0/23, changed state to down
07:58:16: %LINK-3-UPDOWN: Interface FastEthernet0/24, changed state to down
07:58:18: %LINK-3-UPDOWN: Interface FastEthernet0/23, changed state to up
07:58:18: %LINK-3-UPDOWN: Interface FastEthernet0/24, changed state to up
07:58:19: PAgP: Fa0/23 is coming Up
07:58:19: PAgP: Fa0/24 is coming Up
07:58:21: PAgP: Fa0/23 action_a7 is entered
07:58:22: PAgP: Fa0/24 action_a7 is entered
07:58:22: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23,
changed state to up
07:58:23: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24,
changed state to up
07:58:23: %LINK-3-UPDOWN: Interface Port-channel1, changed state to up
07:58:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1,
changed state to up
07:58:27: PAgP - not receiving PAGP PDUs on Fa0/23
07:58:28: PAgP - not receiving PAGP PDUs on Fa0/24
07:58:28: PAgP - not receiving PAGP PDUs on Fa0/23
07:58:28: PAgP: Fa0/24 is going Down
07:58:28: PAgP: Fa0/24 action_a1 is entered
07:58:29: PAgP - not receiving PAGP PDUs on Fa0/23
07:58:29: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24,
changed state to down
07:58:29: PAgP: Fa0/23 is going Down
07:58:29: PAgP: Fa0/23 action_a1 is entered
07:58:30: %LINK-3-UPDOWN: Interface FastEthernet0/24, changed state to down
07:58:30: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23,
changed state to down
07:58:30: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1,
changed state to down
07:58:31: %LINK-3-UPDOWN: Interface Port-channel1, changed state to down
07:58:31: %LINK-3-UPDOWN: Interface FastEthernet0/23, changed state to down
Switch(config-if)#
Switch(config-if)#switchport trunk allowed vlan add 1
Switch(config-if)#shu
08:00:08: %LINK-5-CHANGED: Interface Port-channel1, changed state to
administratively down
08:00:13: %LINK-3-UPDOWN: Interface Port-channel1, changed state to down
Switch(config-if)#
Switch(config-if)#no shu
Switch(config-if)#
08:01:20: %LINK-3-UPDOWN: Interface FastEthernet0/23, changed state to up
08:01:20: %LINK-3-UPDOWN: Interface FastEthernet0/24, changed state to up
08:01:21: PAgP: Fa0/23 is coming Up
08:01:21: PAgP: Fa0/24 is coming Up
08:01:23: PAgP: Fa0/23 action_a7 is entered
08:01:24: PAgP: Fa0/24 action_a7 is entered
08:01:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23,
changed state to up
08:01:25: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24,
changed state to up
08:01:25: %LINK-3-UPDOWN: Interface Port-channel1, changed state to up
08:01:26: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1,
changed state to up
Switch#sh int po 1
Port-channel1 is up, line protocol is up
After this config, I found on the CCO this recommendation about allowed vlan
on C3550:
Note You cannot remove VLAN 1 or VLANs 1002 to 1005 from the allowed VLAN
list.
Thanks for you help
Raul
-----Original Message-----
From: jfaure@sztele.com
To: Mujica, Raul - (Per)
Cc: ccielab@groupstudy.com
Sent: 29/11/2003 14:46
Subject: Re: Etherchannel one way-link question
Hi Raul:
What is your native vlan for these Etherchanel trunks? Belong your
config i
supose it is vlan 1. As maybe traffic control for PAGP goes through this
vlan, and this vlan isn't allowed in the trunks, i supose this cause
link
flapping.
By the other way, if you force the Etherchannel to "no negotiate " (
putting the etherchannel in "on mode") this type of traffic isn't need
and
you don't have problems
Anyone can correct if i'm wrong?
Regards
Juan Faure Ferrer
email: jfaure@sztele.com
Lmnea de Negocio de Telematica y CC
Ingeniero de Integracisn de Redes y Sistemas
------------------------------------------------------------------------
----SOLUZIONA TELECOMUNICACIONES Servicios Profesionales de UNION FENOSA Jerez, 3 28016 MADRID tel 91 579 30 00 fax 91 350 72 83 ------------------------------------------------------------------------ ---
"Mujica, Raul
- (Per)" Para: "'ccielab@groupstudy.com'" <raul.mujica@a <ccielab@groupstudy.com>
ttla.com> cc:
Enviado por: Asunto: Etherchannel one way-link question nobody@groupst
udy.com
29/11/03 07:42
Por favor,
responda a
"Mujica, Raul
- (Per)"
Hi: I have a pair of questions:
1.- Is UDLD the only choice to manage one-way links ?
2.- When I configure UDLP and PAGP (mode desirable on both sides) on the interfaces to form an etherchanel, this is flapping, has someone experienced this ?
interface range FastEthernet0/23-24 switchport trunk encapsulation dot1q switchport trunk allowed vlan 10,20,30 switchport mode trunk no ip address udld enable channel-group 1 mode desirable
But when I use "mode on" and UDLD, the port-group goes up without problem and get stable.
interface range FastEthernet0/23-24 switchport trunk encapsulation dot1q switchport trunk allowed vlan 10,20,30 switchport mode trunk no ip address udld enable channel-group 1 mode on
Regards Raul
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