Hi, You did not paste your configs, but they should be similar to below:
On the 3524 switch ======================== interface GigabitEthernet0/1 switchport trunk encapsulation dot1q switchport mode trunk On the 3524, use the following command: ======================== show interface g0/1 switchport In the display, check the Operational Mode and the Operational Trunking Encapsulation fields On the 6509 switch ======================== set trunk 7/2 nonegotiate dot1q The 6509 trunk should be set to "nonegotiate" mode as the 3524 does not participate in DTP. DTP (dynamic trunk protocol) negotiates the two ends of the link to a compatible mode, reducing the possibility of incompatibility when configuring a link. When connecting a trunk port to a non DTP device, use the non-negotiate option on the DTP-capable device so that the switch port does not generate DTP frames. On the 6509, you should see something similar to this: ======================== Console> (enable) show trunk * - indicates vtp domain mismatch Port Mode Encapsulation Status Native vlan -------- ----------- ------------- ------------ ----------- 7/2 nonegotiate dot1q trunking 1 Port Vlans allowed on trunk -------- --------------------------------------------------------------------- 7/2 1-1005,1025-4094 Port Vlans allowed and active in management domain -------- --------------------------------------------------------------------- 7/2 Port Vlans in spanning tree forwarding state and not pruned -------- --------------------------------------------------------------------- 7/2 Or it could be UDLD working it's magic...try the above first... Hope it helps, Daryl Wan CCIE #7261, CSS1, CCDP, CCSE, MSCE, FCNE, yada yada yada..... -----Original Message----- From: Ouellette, Tim [mailto:[EMAIL PROTECTED]] Sent: Tuesday, April 09, 2002 10:55 AM To: '[EMAIL PROTECTED]' Cc: '[EMAIL PROTECTED]' Subject: 6509 trunk to 3524? Any suggestions Team, can anyone help out. I am seeing the following messages on one of our 6509's. Port 7/2 is connected via fiber to a 3524 closet switch. We've tried replacing the gbic's on both the 6509 and 3524. The port keeps going from connected state to non-connect stat and the trunk port messages underneath is what we see. Can anyone offer any suggestions? distribution 6509 port 7/2 -----fiber----- cisco3524 2002 Apr 08 22:26:26 %DTP-5-TRUNKPORTON:Port 7/2 has become dot1q trunk 2002 Apr 08 22:26:52 %DTP-5-NONTRUNKPORTON:Port 7/2 has become non-trunk 2002 Apr 08 22:30:19 %DTP-5-TRUNKPORTON:Port 7/2 has become dot1q trunk 2002 Apr 08 22:30:23 %DTP-5-NONTRUNKPORTON:Port 7/2 has become non-trunk 2002 Apr 08 22:30:28 %DTP-5-TRUNKPORTON:Port 7/2 has become dot1q trunk distribution6509> (enable) sh port 7/2 Port Name Status Vlan Duplex Speed Type ----- ------------------ ---------- ---------- ------ ----- ------------ 7/2 Tk1382014101-0/1 notconnect 1 full 1000 1000BaseSX Port Security Violation Shutdown-Time Age-Time Max-Addr Trap IfIndex ----- -------- --------- ------------- -------- -------- -------- ------- 7/2 disabled shutdown 0 0 1 enabled 95 Port Num-Addr Secure-Src-Addr Age-Left Last-Src-Addr Shutdown/Time-Left ----- -------- ----------------- -------- ----------------- ------------------ 7/2 0 - - - - - _________________________________________________________________ Commercial lab list: http://www.groupstudy.com/list/commercial.html Please discuss commercial lab solutions on this list. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=40880&t=40880 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
