From: John (jgarrison1@austin.rr.com)
Date: Sat Jul 12 2008 - 11:30:40 ART
All your dot1q tunnel interfaces are in the same vlan. All the l2 info(CDP)
from l2tprotocol-tunnel gets flodded to all ports in the same metro vlan.
Just for giggles put 18 and 21 into a different vlan and see what you get
----- Original Message -----
From: "Shahnawaz Khot" <shahnawaz4ccie@gmail.com>
To: "Cisco certification" <ccielab@groupstudy.com>
Sent: Saturday, July 12, 2008 5:23 AM
Subject: Layer 3 etherchannel with dot1q tunneling.
> Hi,
>
> we have following question and setup in our IE practice labs.
>
> SW3(port14,15) --> connected to --> SW1(port 17,18) then SW1(port
> 20,21) ---> connected to SW4(port 14,15)
>
> Question is to configure layer 3 etherchannel between SW3 and SW4 on these
> ports(port14,15) at either side. An additional vlan is allowed to create
> on
> SW1 for dot1q tunneling.
>
> We have configured SW3 and SW4 for layer3 etherchannel mode ON
> configuration. we configured SW1(ports 17,18,20,21) for following
> interface
> configuration.
>
> switchport access vlan 100
> switchport mode dot1q-tunnel
> l2protocol-tunnel cdp
> no cdp enable
> spanning-tree bpdufilter enable
>
> where addtional vlan 100 is used for all SW1 ports (17,18,20 and 21). This
> works fine but the only issue is with cdp neighbour. Please refer the cdp
> neighbour outputs on SW3 and SW4.
>
>
>
> SW3#show cdp neighbors
> Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
> S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
>
> Device ID Local Intrfce Holdtme Capability Platform Port
> ID
> *SW4 Fas 0/15 174 R S I WS-C3550- Fas
> 0/15
> SW4 Fas 0/14 174 R S I WS-C3550- Fas
> 0/15
> SW4 Fas 0/15 174 R S I WS-C3550- Fas
> 0/14
> SW4 Fas 0/14 174 R S I WS-C3550- Fas
> 0/14
> *SW4 Fas 0/21 164 R S I WS-C3550- Fas
> 0/21
> SW4 Fas 0/20 134 R S I WS-C3550- Fas
> 0/20
> SW4 Fas 0/19 124 R S I WS-C3550- Fas
> 0/19
> BB3 Fas 0/24 166 R 2610 Eth
> 0/0
> SW1 Fas 0/13 121 R S I WS-C3560- Fas
> 0/16
> SW2 Fas 0/18 150 R S I WS-C3560- Fas
> 0/18
> SW2 Fas 0/17 150 R S I WS-C3560- Fas
> 0/17
> SW2 Fas 0/16 150 R S I WS-C3560- Fas
> 0/16
> *SW3 Fas 0/14 142 R S I WS-C3560- Fas
> 0/15
> SW3 Fas 0/15 142 R S I WS-C3560- Fas
> 0/14
> *R3 Fas 0/3 135 R S 3745 Fas
> 0/1
> R5 Fas 0/5 144 R S I 2811 Fas
> 0/1
>
>
>
> And SW4 has following output.
>
>
>
> SW4#show cdp neighbors
> Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
> S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
>
> Device ID Local Intrfce Holdtme Capability
> Platform Port ID
> R4.internetworkexpert.com
> Fas 0/4 122 R S I 2811
> Fas 0/1
> *SW4 Fas 0/14 123 R S I
> WS-C3550-2Fas 0/15
> SW4 Fas 0/15 123 R S I
> WS-C3550-2Fas 0/14
> *SW1 Fas 0/13 130 R S I
> WS-C3560-2Fas 0/19
> *SW3 Fas 0/15 152 R S I
> WS-C3560-2Fas 0/15
> SW3 Fas 0/14 152 R S I
> WS-C3560-2Fas 0/15
> SW3 Fas 0/15 152 R S I
> WS-C3560-2Fas 0/14
> SW3 Fas 0/14 152 R S I
> WS-C3560-2Fas 0/14
> *SW3 Fas 0/21 130 R S I
> WS-C3560-2Fas 0/21
> SW3 Fas 0/20 143 R S I
> WS-C3560-2Fas 0/20
> SW3 Fas 0/19 143 R S I
> WS-C3560-2Fas 0/19
> R2 Fas 0/12 171 R S I 2811
> Fas 0/1
> R1 Fas 0/11 139 R S I 2811
> Fas 0/1
> R6 Fas 0/6 134 R S I 2811
> Fas 0/1
>
>
>
>
>
> On SW3 we are learning SW4 as neigbour twice on interfaces F0/14 and
> F0/15.
> That means 4 times on these same interfaces. Also SW3 learns himself once
> on
> each of these Fa0/14 and Fa0/15 interfaces. We found the similar
> descripencies on SW4 also. But surprsingly we found no issues with
> etherchannel operations. Please help us to understand this reason and
> please
> let us know if we are missing something in our configuration to work CDP
> correctly.
>
>
>
> Thank you,
>
>
>
> Best Regards.
>
> Shahnawaz
>
>
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