From: L. Jankok (lj@2u2.nu)
Date: Fri Jul 04 2008 - 11:07:09 ART
I was just impatient.. waiting a bit longer and the etherchannel came up
with only pagp on the tunnel.. patience.. ;)
On Wed, 02 Jul 2008 21:07:03 +0100
"L. Jankok" <lj@2u2.nu> wrote:
: Hi,
:
: I have three switches.
:
: SW1 <-> SW2 <-> SW3
:
: On SW1 I have a port-channel towards SW2 like this:
:
: interface Port-channel10
: switchport trunk encapsulation dot1q
: switchport mode trunk
: end
:
: On SW3 I have a port-channel towards SW2 like this:
:
: interface Port-channel10
: switchport trunk encapsulation dot1q
: switchport mode trunk
: end
:
: on SW2 I have for the ports to SW1 and SW3 this
:
: interface FastEthernet0/13
: switchport access vlan 100
: switchport mode dot1q-tunnel
: l2protocol-tunnel cdp
: l2protocol-tunnel stp
: l2protocol-tunnel point-to-point pagp
: l2protocol-tunnel point-to-point lacp
: no cdp enable
: end
:
: This results on both SW3 and SW1 in this:
:
: Device ID Local Intrfce Holdtme Capability Platform Port
ID
: Rack1SW1 Fas 0/16 151 S I WS-C3750G Gig
1/0/13
: Rack1SW1 Fas 0/18 151 S I WS-C3750G Gig
1/0/15
: Rack1SW1 Fas 0/17 140 S I WS-C3750G Gig
1/0/14
:
:
: Number of channel-groups in use: 1
: Number of aggregators: 1
:
: Group Port-channel Protocol Ports
:
------+-------------+-----------+-----------------------------------------------
: 10 Po10(SU) PAgP Fa0/16(P) Fa0/17(P) Fa0/18(P)
:
: Question:
: Eventought the protocol of the etherchannel is PAgp if I disable
"l2protocol-tunnel point-to-point lacp"
: on SW2 on the respective interfaces the etherchannel between SW1 and SW3
will go down.
: The switches SW1 and SW3 will still see eacht other through cdp but the
etherchannel will be down.
:
: Why is this happening?. It seems that LACP is needed eventhough PAgP is
used.
:
:
: Regards,
:
: LJ
:
:
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