Trunk went down when added VTP-domain name

[tvaris]

We added VTP domain name to C6000, before addition VTP domain name was empty and switch was configured to VTP server mode. Another switch C5500 was attached to C6000 with trunk link. It was in different VTP domain and it was in VTP client mode. C6000 interface was configured to trunk desirable (or auto), I'm not sure about trunk mode of 5500.

When we added VTP-domain name (different than in C5500) to C6000, therefore C6000's interface went down. And only when we forced interface mode trunk, it started to work.

Is that some common problem? Must that interface mode be forced to trunk, that it works OK when I add new different VTP domain?

Thanks in advance,

Teemu

[milan.kulik · Accepted solution]

Hi,

"For trunking to be autonegotiated, the ports must be in the same VLAN Trunking Protocol (VTP) domain. However, you can use the on or nonegotiate mode to

force a port to become a trunk, even if it is in a different domain."

See http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_8_2/confg_gd/e_trunk.htm

for details.

Regards,

Milan