From: Jensen, Brian D. (bdjensen@eschelon.com)
Date: Mon Jul 30 2007 - 09:55:23 ART
Hi Djerk,
Actually that command will not turn off inverse-arp replies; it only
turns off inverse-arp requests. Your router is functioning correctly.
The only way to get rid of it completely is to turn off inverse-arp on
both ends; that way no one will make a request of the other, so no one
will reply. I don't believe there is a way to turn off replies.
Thanks,
Brian
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Djerk Geurts
Sent: Monday, July 30, 2007 7:44 AM
To: 'Cisco certification'
Subject: No frame-relay inverse-arp
I'm using 12.2(4)10b on 36040's. turning inverse-arp off does not
prevent the router from replying to in-arp requests. (debugged and the
darn things will still send)
*Mar 14 17:39:36.371: Serial2/1: FR ARP input *Mar 14 17:39:36.371:
datagramstart = 0x6FCD4EE, datagramsize = 34 *Mar 14 17:39:36.371: FR
encap = 0x4C110300 *Mar 14 17:39:36.371: 80 00 00 00 08 06 00 0F *Mar 14
17:39:36.371: Serial2/1: FR ARP input08 00 02 04 00 09 00 00 *Mar 14
17:39:36.371: 98 01 2D 05 4C 11 98 01 7B 03 02 02 00 40 *Mar 14
17:39:36.375:
*Mar 14 17:39:36.375: Serial2/1: inarp received on 305 *Mar 14
17:39:36.375: datagramstart = 0x6E0070E, datagramsize = 34 *Mar 14
17:39:36.375: FR encap = 0x4C010300 *Mar 14 17:39:36.375: 80 00 00 00 08
06 00 0F 08 00 02 04 00 09 00 00 *Mar 14 17:39:36.379: 98 01 2D 04 4C 01
98 01 7B 03 02 02 00 40 *Mar 14 17:39:36.379:
*Mar 14 17:39:36.379: Serial2/1: inarp received on 304
Afaik disabling inverse-arp should make a router blind and mute to the
whole inverse-arp thing. I'm about to pull my hair out...
I have R1 - 5 with full mesh F/R between them
- R4 & 5 PtP using main interfaces and no frame-relay inverse-arp at
both ends
- R3 is a hub with R1 & 2 as spokes (main interfaces as well)
- R1 - 3 should use in-arp
A. R1 - 3 advertise their addresses to R4 & 5 via in-arp, I can't change
this behaviour. If allowed I could only disable in-arp per dlci.
B. R1 - 3 learn R4 * 5's addresses (should not happen inho with in-arp
turned off (at the source).
R4 & R5 (diff IP dlci):
interface Serial2/1
description *** C3640-3 (FR) S1/4 ***
ip address 15.1.45.4 255.255.255.0
encapsulation frame-relay
frame-relay map ip 15.1.45.5 405
no frame-relay inverse-arp
R4(config-if)#do sh fram map
Serial2/1 (up): ip 15.1.45.5 dlci 405(0x195,0x6450), static,
CISCO, status defined, active
Serial2/1 (up): ip 15.1.123.1 dlci 401(0x191,0x6410), dynamic,
broadcast,, status defined, active
Serial2/1 (up): ip 15.1.123.2 dlci 402(0x192,0x6420), dynamic,
broadcast,
CISCO, status defined, active
Serial2/1 (up): ip 15.1.123.3 dlci 403(0x193,0x6430), dynamic,
broadcast,
CISCO, status defined, active
R3 MP interface:
interface Serial2/1
description *** C3640-3 (FR) S1/3 ***
ip address 152.1.123.3 255.255.255.0
encapsulation frame-relay
R3(config-if)#do sh fram map
Serial2/1 (up): ip 152.1.45.4 dlci 304(0x130,0x4C00), dynamic,
broadcast,
CISCO, status defined, active
Serial2/1 (up): ip 152.1.45.5 dlci 305(0x131,0x4C10), dynamic,
broadcast,
CISCO, status defined, active
Serial2/1 (up): ip 152.1.123.1 dlci 301(0x12D,0x48D0), dynamic,
broadcast,, status defined, active
Serial2/1 (up): ip 152.1.123.2 dlci 302(0x12E,0x48E0), dynamic,
broadcast,
CISCO, status defined, active
-- Djerk www.djerk.nl
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