weird Frame-relay switch problem

From: Kim Gao (gaoqingli@gmail.com)
Date: Thu Nov 03 2005 - 13:25:09 GMT-3


I setup a lab at home using a bunch of routers

4500 8S as a frame-relay switch
s0---s7 connect to different routers's S0 using cross DTE/DCE cable

On all the serial of 4500, it looks like this:
 interface Serial1
 no ip address
 no ip directed-broadcast
 encapsulation frame-relay
 clockrate 64000
 frame-relay intf-type dce
 frame-relay route 102 interface Serial2 201
 frame-relay route 103 interface Serial3 301
 frame-relay route 104 interface Serial4 401
 frame-relay route 105 interface Serial5 501
 frame-relay route 106 interface Serial6 601
 frame-relay route 107 interface Serial7 701
 frame-relay route 108 interface Serial0 801

On all the DTE routers's s0:

interface Serial0
 no ip address
 encapsulation frame-relay
 no ip mroute-cache
 no frame-relay inverse-arp

All the connection are up except one 2501, the
protocol is down.
I tried to add no keepalive on that 2501 's S0 and the
 corresponding Serial on 4500,
then protocol turns up.

BUT I do not need to do that on any other serials.
Can anyone guess a reason?

Thanks a lot!



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