From: Herbert Maosa (asawilunda@googlemail.com)
Date: Mon Jul 30 2007 - 10:06:36 ART
I believe turning Inverse Arp only stops the router from sending
Inverse ARP requests. But it will be responding to the same unless you
also turn off ARP FRAME-RELAY. However, if all FR enabled routers in
the network have Inverse ARP turned off, then you should not have to
worry about turning off ARP as there is no request to answer anyway.
Herbert.
On 7/30/07, Djerk Geurts <djerk@djerk.nl> wrote:
> 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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-- Kindest regards, hm
This archive was generated by hypermail 2.1.4 : Sat Aug 18 2007 - 08:17:42 ART