Frame Relay Inverse-Arp + Map Statement

From: Andy Needham (andy.needham@xxxxxxxxx)
Date: Sun Feb 25 2001 - 07:59:41 GMT-3

   

I figured I knew Frame-Relay issues until today !!

I have a scenario whereby I am running a Frame-Relay Switch with 4
Remote Spokes.

R1 (s0) 172.1.4.1 ---------> (s0) FrameSwitch
R2 (s0) 172.1.4.2 ---------> (s3) FrameSwitch
R3 (s0) 172.1.4.3 ---------> (s1) FrameSwitch
R4 (s0) 172.1.4.4 ---------> (s2) FrameSwitch

The Frame Network is partial mesh, no PVC's are configured between
R1 and R3, R2 and R3.

FrameSwitch Config :

interface Serial0
 frame-relay route 112 interface Serial3 121
 frame-relay route 114 interface Serial2 141
!
interface Serial1
 frame-relay route 134 interface Serial2 143
!
interface Serial2
 frame-relay route 141 interface Serial0 114
 frame-relay route 142 interface Serial3 124
 frame-relay route 143 interface Serial1 134
!
interface Serial3
 frame-relay route 121 interface Serial0 112
 frame-relay route 124 interface Serial2 142
!

Physical Interfaces are being used at all 4 spokes and in order to
create
a full mesh I have configured Map statements at R1, R2 and R3.

So great, everything works, all Networks available from all Routers. I
now
reload the Routers and expect my Network to run into problems.

According to Caslow 2nd Edition, Page 118, "if the Router is reloaded,
Inverse-Arp
will be disabled for any DLCI that is used with a frame-relay map
Statement"

The Routers reload, the network comes up, all networks are visible !!.
The Static
and Dynamic Maps are still valid.

Is this an IOS level issue (I am running 12.0.8) or am I completely
missing the point ?.

Thanks,

Andy

R1 S0 Config :
!
interface Serial0
 ip address 172.1.4.1 255.255.254.0
 no ip directed-broadcast
 encapsulation frame-relay
 no ip mroute-cache
 no fair-queue
 frame-relay map ip 172.1.4.3 114 broadcast
end

R2 S0 Config :
!
interface Serial0
 ip address 172.1.4.2 255.255.254.0
 no ip directed-broadcast
 encapsulation frame-relay
 no ip mroute-cache
 no fair-queue
 frame-relay map ip 172.1.4.3 124 broadcast
end

R3 S0 Config :
!
interface Serial0
 ip address 172.1.4.3 255.255.254.0
 no ip directed-broadcast
 encapsulation frame-relay
 no ip mroute-cache
 no fair-queue
 frame-relay map ip 172.1.4.1 134 broadcast
 frame-relay map ip 172.1.4.2 134 broadcast
end

R4 S0 Config :
!
interface Serial0
 ip address 172.1.4.4 255.255.254.0
 no ip directed-broadcast
 encapsulation frame-relay
 no ip split-horizon eigrp 1
 no ip mroute-cache
 no fair-queue
end

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