[c-nsp] intra-chassis stacking
sethm at rollernet.us
Fri Mar 30 12:31:40 EST 2007
Joe Abley wrote:
> Hi all,
> I am puzzling over a cisco 2851 which has both a HWIC-D-9ESW 9-port
> switch module and a NM-16ESW-1GIG 16+1 port switch module.
> The switch modules do not seem to be behaving as I would expect. ARPs
> are succeeding and failing apparently at random, OSPF adjacencies are
> not forming, and general layer-2 badness abounds.
> The small amounts of cisco docs available about this configuration
> suggest that "intra-chassis stacking" must be configured, but details
> on exactly what that means are a little light. The best indication I
> have seen suggests that I need to insert a crossover cable between
> the optional gigabit modules on each of the cards; however, it
> doesn't seem like gigabit ports are an option on the 9-port HWIC, and
> the gig port on the 16+1-port NM is already in use.
> I have no requirement for VLANs to span the two modules -- I can
> easily keep all the ports on the 9-port HWIC in a single VLAN, and
> not expect any ports in the 16+1-port NM to join those VLANs.
> Any suggestions as to whether this configuration can be made to work
> in a sane way?
Forgot to include this:
Look for the sections on "Intrachassis Stacking" and "Configuring Stacking".
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