Frame-relay providers are not at all concerneted with
your layer 3 addressing (IP). They are strickly involved
with layer2 in this case your DLCI. All routing in their
network is based on the DLCI not the IP. The router in
the customer network will make the IP routing decisions
which in turn are mapped to Frame-relay DLCI's. If using
map commands you can see.
Frame-relay map IP 1.1.1.1 200 broadcast.
(This tells the router that IP address 1.1.1.1/subnet is
mapped to DLCI 200.
The IP unmunbered in this case is taking the same subnet
from E0 and placing it on the frame-circuit (Layer 3). This
cuts down the the number of IP subnets and routing table size
used in a network.
Hope this helps?
Dan
>From: "Niraj Palikhey" <[EMAIL PROTECTED]>
>Reply-To: "Niraj Palikhey" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: ip unnumbered??
>Date: Wed, 19 Jul 2000 10:18:06 EDT
>
>Hi,
>I am trying to understand why a serial connection (s0) is not assigned an
>ip
>address to connect with the service provider when configured for frame
>relay.
>As a configuration example that one of my friends showed me, his serial 0
>is
>configured for T1, with no ip address, serial 0.2 is configured for frame
>relay as a point-to-point subinterface. There is an ip unnumbered
>Ethernet0/0 command for this interface and also the frame relay
>configuration is set (dlci #, lmi type etc)
>What does this ip unnumbered do in this case?
>Pg. 417 and 418 of the ICRC book from Cisco Press for CCNA 640-407 does
>not
>explain why the physical interface serial 2 and sub-interface serial 2.2
>point-to-point is not configured with any ip address NOR does it explain
>the
>use of the ip unnumbered Serial1(in this case).
>In this scenario, how does this router talk to the service provider's
>router?
>Does it just look at the DLCI number and use the virtual circuit for
>communication to the outside? What is involved?
>Please advise.
>Thank you.
>Kind regards,
>[EMAIL PROTECTED]
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