[c-nsp] Turning off vtp multicasts

[Aivars]

      "VTP version 3"! What is that? Where can that be found?

      Aivars

Friday, September 2, 2005, 3:21:13 AM, you wrote:

RC> VTP version 3 supports the functionality you are looking for. 


RC> - Rob

RC> -----Original Message-----
RC> From: cisco-nsp-bounces at puck.nether.net
RC> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Vinny Abello
RC> Sent: Thursday, September 01, 2005 7:59 PM
RC> To: Bob Tinkelman; cisco-nsp at puck.nether.net
RC> Subject: Re: [c-nsp] Turning off vtp multicasts

RC> Hi Bob,

RC>          I could be mistaken, but I believe VTP is globally on or off on
RC> Cisco switches (ones I've used anyway). I've never seen a way to control it
RC> on a per port basis. I haven't ever setup VTP on a 3550 but I did a quick
RC> look over some things on my switches and it looks like you're going to be
RC> stuck with setting VTP to transparent (disabling it) on the switch if you
RC> have any hope of connecting to NYIIX. Our switch on NYIIX has VTP in
RC> transparent mode as well. Like I said, I could be wrong. I don't have a 3550
RC> to look at. I'd be interested in any solutions there are just out of
RC> curiosity. I've only actually setup VTP on one stack of switches on our
RC> network where it was semi-useful.

RC> By the way, I think "switchport block multicast" only blocks unknown
RC> multicast packets to prevent flooding of a VLAN for which the mac address of
RC> a device has timed out in the arp table or is not in the table at all. Same
RC> with "switchport block unicast" if I remember correctly (but for unicast
RC> traffic).

RC> At 06:01 PM 9/1/2005, Bob Tinkelman 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
RC> 110
>>
>>=========problem-packet================================================
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RC> Vinny Abello
RC> Network Engineer
RC> Server Management
RC> vinny at tellurian.com
RC> (973)300-9211 x 125
RC> (973)940-6125 (Direct)
RC> PGP Key Fingerprint: 3BC5 9A48 FC78 03D3 82E0  E935 5325 FBCB 0100 977A

RC> Tellurian Networks - The Ultimate Internet Connection
RC> http://www.tellurian.com (888)TELLURIAN

RC> "Courage is resistance to fear, mastery of fear - not absence of fear" --
RC> Mark Twain

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