[c-nsp] 802.1q VLANs > 1000 on Cat 5500

[Tim Stevenson]

Sorry, I was not trying to imply that cat5k supports the 4k VLAN range; it 
does not. I was just replying to clarify that it is both hardware and 
software that dictates whether you get dot1q trunk encapsulation at all or not.

Not sure how many external >1K vlans you need to deal with; 5k does support 
a small (7 entries, global) translation table you can use to map dot1q 
vlans to the 1-1000 range. Any frame received on a dot1q trunk with the 
specified 1q vlan tag is translated to the specified "isl" vlan; on 
transmit, the opposite occurs.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_6_3/config/vlans.htm#1020383

Tim

At 05:49 PM 8/3/2005, Rick Ernst quipped:

>I'm able to configure dot1q, but VLAN configuration only accepts VLAN IDs
>1-1005, even though the macreduction is enabled.
>
>
>On Wed, 3 Aug 2005, Tim Stevenson wrote:
>
>:>dot1q support is a function of the linecard, as well as the software.
>:>
>:>Tim
>:>
>:>At 04:46 PM 8/3/2005, Jeff Kell quipped:
>:>>Rick Ernst wrote:
>:>>
>:>> > I am running VLAN transparent. It's almost looking like the entire 
>5500 is
>:>> > ISL.  I came across something on Google where it says that earlier 
>IOS and
>:>> > devices are actually doing ISL under-the-hood for the dot1q 
>implementation.
>:>> > "earlier" is not defined, but it's looking like 12.2 or 12.3 is the
>:>> > earliest image that has support for the full range.  I don't know if 
>CatOS
>:>> > supports it directly, since the 5500 has been EOLd.
>:>>
>:>>CatOS at least back to 5.1(2) supports dot1Q:
>:>>
>:>> > UTC-5500> (enable) sho trunk
>:>> > * - indicates vtp domain mismatch
>:>> > Port      Mode         Encapsulation  Status        Native vlan
>:>> > --------  -----------  -------------  ------------  -----------
>:>> >  1/1      on           dot1q          trunking      1
>:>> >  3/3      on           dot1q          trunking      1
>:>> >  3/4      nonegotiate  isl            trunking      1
>:>> >  3/6      nonegotiate  isl            trunking      1
>:>>
>:>>This is a fairly "straight" 5500 (no RSM, only NFFC-II cards).
>:>>
>:>>Jeff
>:>>_______________________________________________
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>:>
>:>
>:>
>:>Tim Stevenson, tstevens at cisco.com
>:>Routing & Switching CCIE #5561
>:>Technical Marketing Engineer, Catalyst 6500
>:>Cisco Systems, http://www.cisco.com
>:>IP Phone: 408-526-6759
>:>********************************************************
>:>The contents of this message may be *Cisco Confidential*
>:>and are intended for the specified recipients only.
>:>



Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
********************************************************
The contents of this message may be *Cisco Confidential*
and are intended for the specified recipients only.