Can't get trunk working between Catalyst 2960G and 4507R

My network has a 4507R at the core with 3750G's and 3560G's configured for trunking using 802.1q. Trunking works on all switches except for a newly configured 2960G. I configured the 2960G exactly like my other switches with the exception of the encapsulation command for 802.1q because they only support 802.1q. If I go to my 4507 and do a "sh cdp nei det" I can see the 2960G but it shows that no IP addresses are configured. If I do the same command on the 2960G I can see the 4507 but I cannot telnet to its IP address. The management vlan is 50 which shows as being up everywhere except for the 2960G. I am pasting parts of my config here in the hopes that I can get help. Also, the VTP mode on the 4507 is set to transparent.



interface GigabitEthernet0/52 switchport trunk encapsulation dot1q switchport trunk native vlan 50 switchport mode trunk ! interface Vlan1 no ip address shutdown ! interface Vlan50 ip address

CONFIG FROM NON-WORKING 2960G inteface GigabitEthernet0/48 switchport trunk native vlan 50 switchport mode trunk ! interface Vlan50 ip address no ip route-cache

RESULTS OF "SH CDP NEI DET" ON MY 4507 for non-working switch Device ID: HSB1 Entry address(es): IP address: Platform: cisco WS-C2960G-48TC-L, Capabilities: Switch IGMP Interface: GigabitEthernet5/2, Port ID (outgoing port): GigabitEthernet0/48 Holdtime : 137 sec

Version : Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version

12.2(25)SEE2, RELE ASE SOFTWARE (fc1) Copyright (c) 1986-2006 by Cisco Systems, Inc. Compiled Fri 28-Jul-06 04:33 by yenanh

advertisement version: 2 Protocol Hello: OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=0000000

0FFFFFFFF010221FF000000000000001A6C2FA280FF0000 VTP Management Domain: 'MYNET' Native VLAN: 50 Duplex: full Management address(es): IP address: Unidirectional Mode: off

Thanks for your help

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interface Vlan50 no shutdown


just a guess

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Martin Bilgrav

Check your VLAN table to make sure that the 2960 actually created vl50 (sh vlan). This would be consistent with you not seeing vl50's IP in the CDP detail on the 4507.

Crank up your buffered logging to debugging and see if anything useful is being logged.

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It does not appear in the vlan table. I will check the logs too. I opened a case with Cisco but we played phone tag for most of the day and I finally ended up going home.

J wrote:

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so what happens when you manually create it?

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Does the 2950 need the

#vlan database (vlan)#vlan 50 (vlan)#exit #


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Thanks. That was exactly what it needed. I just got off the phone with Cisco TAC and he had me key this in. Now the vlan works.

Thanks for your help! wrote:

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