[c-nsp] Turning off vtp multicasts

[Wojtek Zlobicki]

BPDU-FILTER / BPDU-GUARD may do what you need.

On 9/1/05, Bob Tinkelman <bob at tink.com> wrote:
> 
> I have a WS-C3550-12G running c3550-i5k2l2q3-mz.121-20.EA1.bin.
> (Yes, I know; that's a bit stale, but the switch has been up and
> running for over 16 months.)
> 
> We are trying to connect one of its ports to a peering switch.
> The engineer managing the peering switch has complained to us
> that our switch is emitting vtp multicasts.
> 
> An example is included at the end of this email.
> 
> We want to continue running vtp on this router but, to comply
> with this request, would like to surpress any vtp multicasts on
> this particular port.
> 
> I reached the point where I was just changing various config
> options (not quite at random) hoping to find one that would make
> a difference. At the moment, the config looks like this:
> 
> | switch1.nycmnycz#sho run int g0/1
> | Building configuration...
> |
> | Current configuration : 265 bytes
> | !
> | interface GigabitEthernet0/1
> | description nyiix
> | switchport access vlan 101
> | switchport mode access
> | switchport block multicast
> | no cdp enable
> | spanning-tree portfast
> | spanning-tree bpdufilter enable
> | spanning-tree bpduguard enable
> | spanning-tree guard none
> | end
> 
> 
> Any suggestions or pointers to appropriate documentation would
> be much appreciated.
> --
> Bob Tinkelman <bob at tink.com>
> ISPnet, Inc. 718.464.4747
> 
> 
> 
> 
> =========problem-packet=====================================================
> 
> SW-NYIIX2#RX-JC-FORMAT filter[1] 181-23:01:34 (03241800)
> 00: 2cac 0f8f 5010 0001-0000 0000 f773 000c FID = 2cac
> 10: 0100 0ccc cccc 0009-442f 6581 0060 aaaa Offset = 10
> 20: 0300 000c 0111 2101-114a 0001 000f 4348 VLAN = 1(0001)
> 30: 4b30 3631 3856 3053-4e00 0200 0947 6930 CAM = 0(00000,00000*2)
> Pri CPU MON PriTag MVID PType US BRD DAV SAV DPV SV ER TXA SAS Tag SRC 
> Size
> 0 0 0 0 0 f 0 1 0 1 0 0 0 0 0 0 1/1 110
> 
> 
> =========problem-packet=====================================================
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-- 
----------------------------------------
wojtek.zlobicki at gmail.com