At 04:15 PM 7/14/00, Niraj Palikhey wrote:
>Hi,
>I am trying to understand as to why an ip address is not assigned to the
>serial interfaces of a router that is configured as a frame relay switch.
>Is this only for a lab environment or is this how it is also done in the
>real world?
>Also each interface is assigned as a dce interface. Why does the router
>need this to support switching?
When I teach basic Cisco router configuration, I have the student in the
middle who is configuring the Frame Relay switch remove ip addresses to
bring home the fact that the switch is a data-link-layer device. All it has
to know is that when a frame comes in on port x with DLCI x, it should go
out port y with DLCI y.
The router serial ports on either side of the switch should have IP
addresses and be in the same subnet.
On the other hand, it wouldn't really hurt to have IP addresses on the
switch. With addresses, you could ping and use SNMP for troubleshooting. I
think removing the addresses is just a good pedagogical technique so that
you understand what's really going on. In the real world, I believe service
providers give switch interfaces IP addresses to facilitate troubleshooting.
Regarding DCE, one side of the link must use the command "frame-relay
intf-type dce." It makes most sense to put that on the switch, but in
actuality it doesn't matter which side has the command. It doesn't
necessarily have to be the side that has the DCE end of the cable connected
and the "clockrate" command configured, but once again for pedagogical
reasons I always do it on that side. So my "frame-relay switch" ends us
with the following config. (There are other ways to do it, but I like this
one):
frame-relay switching
interface serial 0
no ip address
clockrate 56000
encapsulation frame-relay
frame-relay intf-type dce
frame-relay route 100 interface Serial1 200
interface serial 1
no ip address
clockrate 56000
encapsulation frame-relay
frame-relay intf-type dce
frame-relay route 200 interface Serial0 100
Priscilla
>Can someone help?
>Thank you.
>Kind regards,
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