Re: L2 tunnel in tunnel

Simple setup is easy and has been tested successfully. In this case,
SW2 and SW3 are backbone core switches and the setup on SW2 and SW3
provides tunnel for the Etherchannel between SW1 and SW4. When the
ports SW1 fa0/1 and SW4 fa0/4 are shut down, the EtherChannel between
them is working as expected -- sh cdp nei, SW1 sees SW4 only and SW4
sees SW1 only.

The problem is, as soon as SW1 fa0/1 is set up as dot1q mode, the ports
23 and 24 become err-disable.
(1) explanation?
(2) any remedy?

Thanks,
Jack

On 06/16/2011 12:51 PM, Roy Khan wrote:
> Dear
>
>
> Make things simple suppose R1 and R4 is your customer and the SW1 SW2,
> SW3, and SW4 is SP. the Tunnel configuration need only on SW1 and SW4
> No need to configure any thing in SW2 and SW3 just create the simple
> trunk try it and tell me its working or not...
>
> > Date: Thu, 16 Jun 2011 12:34:06 -0400
> > From: ccie.unnumbered_at_gmail.com
> > To: ccielab_at_groupstudy.com
> > Subject: L2 tunnel in tunnel
> >
> > Physical connection:
> >
> R1(fa0/0)---(1)SW1(23,24)---(23,24)SW2(21,22)---(21,22)SW3(23,24)---(23,24)SW4(4)---(fa0/1)R4
> >
> > The goal is for R1 and R4 to be able to ping each other by 14.0.0.x and
> > 41.0.0.x.
> > The following configuration does not work. Can some one explain why?
> >
> > Thanks,
> > Jack
> > ------------------------------------
> > R1:
> > interface FastEthernet0/0
> > no ip address
> > speed 100
> > full-duplex
> > !
> > interface FastEthernet0/0.14
> > encapsulation dot1Q 14
> > ip address 14.0.0.1 255.255.255.0
> > !
> > interface FastEthernet0/0.41
> > encapsulation dot1Q 41
> > ip address 41.0.0.1 255.255.255.0
> >
> > R4:
> > interface FastEthernet0/1
> > no ip address
> > speed 100
> > full-duplex
> > !
> > interface FastEthernet0/1.14
> > encapsulation dot1Q 14
> > ip address 14.0.0.4 255.255.255.0
> > !
> > interface FastEthernet0/1.41
> > encapsulation dot1Q 41
> > ip address 41.0.0.4 255.255.255.0
> >
> >
> > SW1:
> > interface Port-channel4
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> > interface FastEthernet0/1
> > switchport access vlan 140
> > switchport mode dot1q-tunnel
> > l2protocol-tunnel cdp
> > l2protocol-tunnel lldp
> > l2protocol-tunnel stp
> > l2protocol-tunnel vtp
> > no cdp enable
> > !
> > interface FastEthernet0/23
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 4 mode desirable
> > !
> > interface FastEthernet0/24
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 4 mode desirable
> >
> >
> > SW2:
> > interface Port-channel3
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> > interface FastEthernet0/21
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 3 mode desirable
> > !
> > interface FastEthernet0/22
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 3 mode desirable
> > !
> > interface FastEthernet0/23
> > switchport access vlan 100
> > switchport mode dot1q-tunnel
> > l2protocol-tunnel cdp
> > l2protocol-tunnel lldp
> > l2protocol-tunnel stp
> > l2protocol-tunnel vtp
> > l2protocol-tunnel point-to-point pagp
> > no cdp enable
> > no cdp tlv server-location
> > no cdp tlv app
> > !
> > interface FastEthernet0/24
> > switchport access vlan 200
> > switchport mode dot1q-tunnel
> > l2protocol-tunnel cdp
> > l2protocol-tunnel lldp
> > l2protocol-tunnel stp
> > l2protocol-tunnel vtp
> > l2protocol-tunnel point-to-point pagp
> > no cdp enable
> > no cdp tlv server-location
> > no cdp tlv app
> >
> >
> > SW3:
> > interface Port-channel2
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> > interface FastEthernet0/21
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 2 mode desirable
> > !
> > interface FastEthernet0/22
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 2 mode desirable
> > !
> > interface FastEthernet0/23
> > switchport access vlan 100
> > switchport mode dot1q-tunnel
> > l2protocol-tunnel cdp
> > l2protocol-tunnel lldp
> > l2protocol-tunnel stp
> > l2protocol-tunnel vtp
> > l2protocol-tunnel point-to-point pagp
> > no cdp enable
> > no cdp tlv server-location
> > no cdp tlv app
> > !
> > interface FastEthernet0/24
> > switchport access vlan 200
> > switchport mode dot1q-tunnel
> > shutdown
> > l2protocol-tunnel cdp
> > l2protocol-tunnel lldp
> > l2protocol-tunnel stp
> > l2protocol-tunnel vtp
> > l2protocol-tunnel point-to-point pagp
> > no cdp enable
> > no cdp tlv server-location
> > no cdp tlv app
> >
> >
> > SW4:
> > interface Port-channel1
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> > interface FastEthernet0/4
> > switchport access vlan 140
> > switchport mode dot1q-tunnel
> > l2protocol-tunnel cdp
> > l2protocol-tunnel lldp
> > l2protocol-tunnel stp
> > l2protocol-tunnel vtp
> > no cdp enable
> > !
> > interface FastEthernet0/23
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 1 mode desirable
> > !
> > interface FastEthernet0/24
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 1 mode desirable
> > !
> >
> >
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Received on Thu Jun 16 2011 - 13:52:55 ART