Scott,
pvst+ is actually implemented in the newer versions of ios when using
dot1q :-)
Mark.
At 12:44 AM 11/5/00 +, Scott Aitken wrote:
>Hi all,
>I have come up with a design and would appreciate some feedback, tips, or
>pointers etc.
>
>2 routers connected to 3 switches.
>2x3660 w/4 x F/Ethernet
>1x4006 w/1 GBIC
>3524XL w/1 GBIC
>3524XL
>
>Routers are connected to each switch, trunked. Switches are connected as
>such:
>
>[4006 GBIC] [GBIC 3524XL F/EtherChannel] == [F/Etherchannel 3524XL]
>
>The routers are also directly connected back to back via F/Ethernet.
>
>Therefore, each router has 4 trunks. One to each switch, and one to the
>other router.
>I have configured dot1q trunking, with Vlan 1 the native Vlan.
>
>Each Vlan on the router appears four times, on a subinterface on each
>f/ethernet interface. Each Vlan has its own bridge group. IRB is
>configured and a BVI created to route between the Vlans (no layer 3 on the
>fast ethernet trunks or subinterface).
>
>A sample config of a router...
>
>interface fastethernet 0/1
>no ip address
>speed 100
>duplex full
>
>interface fastethernet 0/0.1
>encapsulation dot1q 1 native
>bridge-group 1
>
>interface fastethernet 0/0.10
>encapsulation dot1q 10
>bridge-group 10
>
>interface fastethernet 0/1.1
>encapsulation dot1q 1 native
>bridge-group 1
>
>interface fastethernet 0/1.10
>encapsulation dot1q 10
>bridge-group 10
>
>interface BVI1
>ip address 10.1.0.1 255.255.0.0
>
>interface BVI10
>ip address 10.10.0.1 255.255.0.0
>
>bridge 1 protocol ieee
>bridge 1 route ip
>
>bridge 10 protocol ieee
>bridge 10 route ip
>
>... and so on ... (about 15 vlans in total).
>
>(this was typed in from memory so please excuse any typos)
>
>
>One issue I have is that the switches complain regularly about mac-addresses
>appearing on multiple trunks (flapping).
>Perhaps this is just a warning, as only really one interface should be
>providing connectivity for any given Vlan thanks to spanning tree.
>
>Will dot1Q spanning tree have problems with the ieee spanning tree on the
>router. (or should I configure PVST?)
>
>Just to add spice, I've actually got HSRP running on each BVI so that both
>routers share the default gateway address for each Vlan.
>
>Thanks all,
>Scott Aitken
>
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