From: Ronnie Angello (ronnie.angello@gmail.com)
Date: Fri May 04 2007 - 10:41:26 ART
When a port is configured as a dot1q tunnel port, cdp is automatically
disabled on the port.
On 5/4/07, CCIE Reader <myolddays@yahoo.co.in> wrote:
>
> Hi,
> I am struck on dot1q tunelling while doing my IE4.0 Lab7-sec 1.4.
> R3 and R1 shud appear as though directly connected to SW2 by configuring
> L2PT of CDP.
>
> I did this and I cud see CDP info of SW2 on both R1 and R3.. but not on
> SW2.
>
> I have attached my testbed port details and configs here..
>
> Have a look and let me know where am missing.
>
> Thanks.
>
>
>
>
>
> ---------------------------------
> Heres a new way to find what you're looking for - Yahoo! Answers
> R1,R3 connected to F0/1,F0/3 ports of SW1. SW1 and SW4 trunked via F0/11.
> SW4 f0/8,f0/9 connected to SW2 f0/8,f0/9..
>
> SW2 f0/8 is configured with no switchport and given the IP in same subnet
> as R3.
> SW2 f0/9 is configured with no switchport and given the IP in same subnet
> as R1.
>
> SW1 f0/1,f0/3 is configured to do dot1q tunnel
> SW4 f0/8,f0/9 is configured to do dot1q tunnel
>
>
> am unable to see R1,R3 info on SW2.
> whereas am able to see SW2 info on both R1 and R3
>
> System MTU is set to 1504. Also am unable to ping between R1,SW2 and
> R3,SW2.
>
>
>
> SW1:
> ==========
>
> interface FastEthernet0/1
> switchport access vlan 100
> switchport mode dot1q-tunnel
> l2protocol-tunnel cdp
> no cdp enable
> end
>
> SW1#sh run int f0/3
> Building configuration...
>
> Current configuration : 129 bytes
> !
> interface FastEthernet0/3
> switchport access vlan 101
> switchport mode dot1q-tunnel
> l2protocol-tunnel cdp
> no cdp enable
> end
>
> SW1#sh run int f0/11
> Building configuration...
>
> Current configuration : 107 bytes
> !
> interface FastEthernet0/11
> switchport trunk encapsulation dot1q
> switchport mode dynamic desirable
> end
>
> SW1#
>
>
> SW1#sh cdp ne
> SW1#sh 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 0/13 135 S I WS-C3550- Fas
> 0/13
> SW4 Fas 0/12 135 S I WS-C3550- Fas
> 0/12
> SW4 Fas 0/11 155 S I WS-C3550- Fas
> 0/11
> SW2 Fas 0/24 178 R S I WS-C3550- Fas
> 0/24
> SW2 Fas 0/23 177 R S I WS-C3550- Fas
> 0/23
> SW2 Fas 0/22 177 R S I WS-C3550- Fas
> 0/22
> SW3 Fas 0/9 131 S I WS-C3550- Fas
> 0/9
> SW3 Fas 0/8 131 S I WS-C3550- Fas
> 0/8
> SW3 Fas 0/7 131 S I WS-C3550- Fas
> 0/7
> SW1#
>
>
>
>
>
>
>
>
>
>
>
> SW4:
> ===========
>
>
> interface FastEthernet0/11
> switchport trunk encapsulation dot1q
> switchport mode dynamic desirable
> end
>
> SW4#sh run int f0/8
> Building configuration...
>
> Current configuration : 129 bytes
> !
> interface FastEthernet0/8
> switchport access vlan 101
> switchport mode dot1q-tunnel
> l2protocol-tunnel cdp
> no cdp enable
> end
>
> SW4#sh run int f0/9
> Building configuration...
>
> Current configuration : 129 bytes
> !
> interface FastEthernet0/9
> switchport access vlan 100
> switchport mode dot1q-tunnel
> l2protocol-tunnel cdp
> no cdp enable
> end
>
> SW4#
>
>
> SW4#sh 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
> SW1 Fas 0/13 137 S
> I WS-C3560-2Fas 0/13
> SW1 Fas 0/12 137 S
> I WS-C3560-2Fas 0/12
> SW1 Fas 0/11 127 S
> I WS-C3560-2Fas 0/11
> SW2 Fas 0/7 174 R S I
> WS-C3550-2Fas 0/7
> SW3 Fas 0/23 138 S
> I WS-C3550-2Fas 0/23
> SW3 Fas 0/24 138 S
> I WS-C3550-2Fas 0/24
> SW3 Fas 0/22 138 S
> I WS-C3550-2Fas 0/22
> SW4#
>
>
>
>
> SW2:
>
> SW2#sh run int f0/8
> Building configuration...
>
> Current configuration : 85 bytes
> !
> interface FastEthernet0/8
> no switchport
> ip address 163.1.38.8 255.255.255.0
> end
>
> SW2#sh run int f0/9
> Building configuration...
>
> Current configuration : 85 bytes
> !
> interface FastEthernet0/9
> no switchport
> ip address 163.1.18.8 255.255.255.0
> end
>
> SW2#
>
>
>
> SW2#sh 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 0/7 130 S
> I WS-C3550-2Fas 0/7
> BB2 Fas 0/21 157 R
> 2610 Eth 0/0
> SW1 Fas 0/24 155 S
> I WS-C3560-2Fas 0/24
> SW1 Fas 0/23 154 S
> I WS-C3560-2Fas 0/23
> SW1 Fas 0/22 154 S
> I WS-C3560-2Fas 0/22
> SW3 Fas 0/13 166 S
> I WS-C3550-2Fas 0/13
> SW3 Fas 0/12 166 S
> I WS-C3550-2Fas 0/12
> SW3 Fas 0/11 166 S
> I WS-C3550-2Fas 0/11
> SW2#
>
>
>
> R1:
> ===========
>
> R1#sh run int f1/0
> Building configuration...
>
> Current configuration : 95 bytes
> !
> interface FastEthernet1/0
> ip address 163.1.18.1 255.255.255.0
> duplex auto
> speed auto
> end
>
> R1#sh cdp ne
> R1#sh cdp neighbors
> Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
> S - Switch, H - Host, I - IGMP, r - Repeater
>
> Device ID Local Intrfce Holdtme Capability Platform Port
> ID
> SW2 Fas 1/0 176 R S I WS-C3550-2Fas
> 0/9
> R1#
>
>
>
> R3:
> ================
> R3#sh run int f0/0
> Building configuration...
>
> Current configuration : 95 bytes
> !
> interface FastEthernet0/0
> ip address 163.1.38.3 255.255.255.0
> duplex auto
> speed auto
> end
>
> R3#sh cdp ne
> R3#sh cdp neighbors
> Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
> S - Switch, H - Host, I - IGMP, r - Repeater
>
> Device ID Local Intrfce Holdtme Capability Platform Port
> ID
> SW2 Fas 0/0 176 R S I WS-C3550-2Fas
> 0/8
> R3#
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
-- Ronald Angello CCIE #17846
This archive was generated by hypermail 2.1.4 : Fri Jun 01 2007 - 06:55:20 ART