fallback bridging...

i suspect that there shouldn't be a mention of this for ccnp certification, since most indications that i'm seeing have it at ccie, even if there...  but the idea is interesting...

this is simple enough... create a bridge group for legacy non-routable protocols to pass between  svi's or l3 interfaces, such as decnet...  (is that even out there anymore?)

dls1(config)#bridge 1 protocol vlan-bridge
dls1(config)#

that statement turns it on, then configure svi's (int vlan x) into a bridge group, say 1...

dls1(config)#int vlan 10
dls1(config-if)#bridge-group 1
dls1(config-if)#end
dls1#sh bridge
Br Group    Mac Address       State      Type        Ports
--------    -----------       -----      ----        -----
   1        0009.b73f.ce87    Forward    DYNAMIC     Vl10 Po1
dls1#


this is very exciting...  chances are you'll never need it nowadays... however, i was alarmed when i read that 3550's might treat ipv6 as a non-routable protocol (read, not ipv4) in older versions of ios...

but no, arteq, you say, this simply cannot be...

dls1#sh ipv6 proto

dls1#




good Lord...

dls1(config)#ipv6 unicast-routing
dls1(config)#do sh ipv6 proto
IPv6 Routing Protocol is "connected"
dls1(config)#

good 3550...