From: Ansar Mohideen (ansar@garmco.com)
Date: Sun May 04 2003 - 05:21:50 GMT-3
Hi,
After disabling inverse arp you need to restart the router in order to
remove the dynamic mapping created. I am not sure what happens when you
shutdown and disable inarp and re enable the interface.
Rgds
-----Original Message-----
From: Robert Yee [mailto:robert@bluespud.com]
Sent: Sunday, May 04, 2003 9:29 AM
To: ccielab@groupstudy.com
Subject: Does disabling inverse arp on physical interface, disable it on
subinterface?
Hi,
I was working on a FRTS question that I had, but it is leading me to an
Inverse ARP problem.
I was under the impresssion that if I disable inverse arp on the physical
interface, that the subinterfaces would also have inverse arp disabled.
To test my orginal understanding, I dis the following:
1. Shut down serial interface
2. Configure 'encap frame'
3. Configure 'no frame-relay inverse arp'
4. Configure int s0.24 with 'frame-relay interface-dlci...'
5. Configure int s0.256 with 'frame-relay interface-dlci...'
6. Enabled serial interface.
I expected that no dynamic maps would appear...I was wrong. here is the
output:
r2(config)#int s0
r2(config-if)#shut
r2(config-if)#encap frame
00:02:45: %LINK-5-CHANGED: Interface Serial0, changed state to
administratively down
00:02:46: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed
state to down
r2(config-if)#encap frame
r2(config-if)#no frame inver
r2(config-if)#int s0.24 multi
r2(config-subif)#ip add 150.50.24.2 255.255.255.0
r2(config-subif)#frame interface-dlci 104
r2(config-fr-dlci)#int s0.256
r2(config)#int s0.256 multi
r2(config-subif)#ip add 150.50.100.2 255.255.255.224
r2(config-subif)#int s0.256
r2(config-subif)#frame interface-dlci 105
r2(config-fr-dlci)#frame interface-dlci 106
r2(config-fr-dlci)#exit
r2(config)#int s0
r2(config-if)#no shut
r2#sh run
r2#debug frame packet
Frame Relay packet debugging is on
r2#sh frame map
00:07:01: Serial0.24(o): dlci 104(0x1881), pkt encaps 0x0300 0x8000 0x0000
0x806 (ARP), datagramsize 34
00:07:01: FR: Sending INARP Request on interface Serial0.24 dlci 104 for
link 7(IP)
00:07:01: Serial0.256(o): dlci 106(0x18A1), pkt encaps 0x0300 0x8000 0x0000
0x806 (ARP), datagramsize 34
00:07:01: FR: Sending INARP Request on interface Serial0.256 dlci 106 for
link 7(IP)
00:07:01: Serial0.256(o): dlci 105(0x1891), pkt encaps 0x0300 0x8000 0x0000
0x806 (ARP), datagramsize 34
00:07:01: FR: Sending INARP Request on interface Serial0.256 dlci 105 for
link 7(IP)
00:07:01: broadcast dequeue
00:07:01: Serial0.24(o):Pkt sent on dlci 104(0x1881), pkt encaps 0x300
0x8000 0x0 0x806 (ARP), datagramsize 34
00:07:01: broadcast dequeue
00:07:01: Serial0.256(o):Pkt sent on dlci 106(0x18A1), pkt encaps 0x300
0x8000 0x0 0x806 (ARP), datagramsize 34
00:07:01: broadcast dequeue
00:07:01: Serial0.256(o):Pkt sent on dlci 105(0x1891), pkt encaps 0x300
0x8000 0x0 0x806 (ARP), dat
agramsize 34
00:07:01: Serial0(i): dlci 104(0x1881), pkt encaps 0x0300 0x8000 0x0000
0x806 (ARP), datagramsize 34
00:07:01: Serial0(i): dlci 106(0x18A1), pkt encaps 0x0300 0x8000 0x0000
0x806 (ARP), datagramsize 34
00:07:01: Serial0(i): dlci 105(0x1891), pkt encaps 0x0300 0x8000 0x0000
0x806 (ARP), datagramsize 34
00:07:01: Serial0.24: frame relay INARP received
00:07:01: Serial0.256: frame relay INARP received
00:07:01: Serial0.256: frame relay INARP received
r2#sh frame map
Serial0.24 (up): ip 150.50.24.4 dlci 104(0x68,0x1880), dynamic,
broadcast,, status defined, active
Serial0.256 (up): ip 150.50.100.5 dlci 105(0x69,0x1890), dynamic,
broadcast,, status defined, active
Serial0.256 (up): ip 150.50.100.6 dlci 106(0x6A,0x18A0), dynamic,
broadcast,, status defined, active
r2#
Any ideas where I went wrong?
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