All,
   I am stumped by some behavior I am seeing in my lab when testing
frame-relay.  I have a 4000 configured as a frame switch; nothing special,
just the standard frame-relay route commands necessary to switch the traffic
between two other routers (we'll call them rtrA & rtrB, for clarity.) On
rtrA, I have configured a physical interface with a map statement.  On rtrB,
I have configured a P2P sub-interface with a "frame-relay interface dlci
xxx" statement (you can't use a map statement on a P2P interface, the router
complains).  All works fine, and I can ping rtrB and rtrA from rtrA and vice
versa (In other words, I can ping my own interface and the remote interface
on both routers).  Here's where it gets weird...If I delete the P2P
interface on rtrB, reload to get rid of the residue, then reconfigure the
router with a multipoint sub-interface and a map statement, I can still ping
rtrA just fine, but I lose the ability to ping rtrB from rtrB itself (i.e.
pinging my own interface)  I lose the ability to ping rtrA's interface from
rtrA at this point as well.  Debug output shows the typical "encapsulation
failed" error, but I'm at a loss as to why I can ping the remote router, but
not my own interface?  Anyone have any thoughts?  I'm sure I'm missing
something, but for the life of me, I can't figure out what it is.  Thanks in
advance for any input.

Kelly Cobean, CCNP,CCSA,ACSA,MCSE,MCP+I


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