From: Manjeet Chawla (mchawla@xxxxxxxxxx)
Date: Mon Oct 11 1999 - 20:35:54 GMT-3
James:
I used another older router (ROM5.2) for the same test with same results. So
when the router reboots, it in-arps first before using the map statements
regardless of BootROM version.
If you do "Clear Frame", it does not inarp automatically and all you have is
Static entry. Reboot/shut-noshut brings the dynamic entry back.
Thanks all for responding to my question. This really gave me a new boost to th
e
try new things.
Regards
Manjeet
Hi Manjeet - just built this one to try it out and I get some interesting
> results
>
> One of my spokes has ONLY the static map (this has v11.2.4 code and v10 Boot
> ROM's) just like Bruce Caslow says
> The other has both the static map and the dynamic entry to the HUb(this has
> v11.2.14 and v11 Boot Roms)
>
> I am guessing this has something to do with revision of BOOT ROMs
>
> I am using 2500 hundreds which load up their boot ROM images before the
> Flash Image and so I would guest that this is the origin of the difference.
>
> I would guess that older boxes like one of mine (and Mr Caslows!) does not
> have Inverse ARP support in the boot ROM, where as the new one does. When
> newer boxes boot they Inverse ARP (from BOOT code) before reading the NVRAM
> - leading to the dynamic entry - and then install the static maps when the
> config file is read.
>
> AN ASIDE: Older Boot ROMs DEFINATELY had a more limited support for Frame as
> the failure of earlier BOOT code to support inverse arp meant that
> techniques such as Autoinstall did not work for routers going onto Frame
> networks.
>
> Manjeet - what version Boot ROMs are you using (sh version)
>
> Regards
>
> James
> > -----Original Message-----
> > From: Manjeet Chawla [SMTP:mchawla@asanet.com]
> > Sent: Monday, 11 October 1999 14:47
> > To: ccielab@groupstudy.com
> > Subject: Frame Map /Inverse arp
> >
> > Hi everyone !
> >
> > I have a frame relay map/inverse arp question. As per Caslow, page 118
> > under "A Word of Caution...." paragaph-1; it says:
> >
> > If a router is reload, inverse arp will be disabled for any DLCI that is
> > used with any frame relay map statements....
> >
> >
> > I have three routers (plus a router as FR Switch):
> >
> > Routers Spoke-1 and Spoke-2 connect to Hub router (via FR switch).
> >
> > Spoke-1 and 2 cannot ping each other as no map exists. If I am
> > understanding it right, If I use FR map on Spoke-1 and 2 and reload the
> > spokes, the inverse arp will be disabled on the spokes and under "show
> > FR map" I should see only the static map (and no dynamic). Well, I see
> > both static (to other spoke) and dynamic (to the hub).
> > Am I mis-interpretting the book ?
> >
> > My configs and FR MAP outputs are as below:
> >
> >
> > Thanks all for your helo in advance.
> > Manjeet Chawla
> >
> >
> >
> >
> > SWITCH:
> > interface Serial0
> > no ip address
> > encapsulation frame-relay
> > no fair-queue
> > frame-relay intf-type dce
> > frame-relay route 102 interface Serial1 201
> > frame-relay route 103 interface Serial2 301
> > !
> > interface Serial1
> > no ip address
> > encapsulation frame-relay
> > frame-relay intf-type dce
> > frame-relay route 201 interface Serial0 102
> > !
> > interface Serial2
> > no ip address
> > encapsulation frame-relay
> > frame-relay intf-type dce
> > frame-relay route 301 interface Serial0 103
> > !
> > end
> >
> >
> > HUB:
> > interface Serial0
> > ip address 172.16.3.3 255.255.255.0
> > encapsulation frame-relay
> > no fair-queue
> > clockrate 2000000
> >
> > Hub#sh fr map
> > Serial0 (up): ip 172.16.3.1 dlci 102(0x66,0x1860), dynamic,
> > broadcast,, status defined, active
> > Serial0 (up): ip 172.16.3.2 dlci 103(0x67,0x1870), dynamic,
> > broadcast,, status defined, active
> > Hub#
> >
> >
> > SPOKE-1:
> > interface Serial0
> > ip address 172.16.3.1 255.255.255.0
> > encapsulation frame-relay
> > no ip mroute-cache
> > no fair-queue
> > clockrate 2000000
> > frame-relay map ip 172.16.3.2 201
> > !
> > end
> >
> > Sh frame map
> > Serial0 (up): ip 172.16.3.2 dlci 201(0xC9,0x3090), static,
> > <------------------------
> > CISCO, status defined, active
> > Serial0 (up): ip 172.16.3.3 dlci 201(0xC9,0x3090), dynamic,
> > <--------------------
> > broadcast,, status defined, active
> >
> >
> >
> > SPOKE-2
> > interface Serial0
> > ip address 172.16.3.2 255.255.255.0
> > encapsulation frame-relay
> > no fair-queue
> > clockrate 2000000
> > frame-relay map ip 172.16.3.1 301
> > !
> >
> > spoke-2#sh fr map
> > Serial0 (up): ip 172.16.3.1 dlci 301(0x12D,0x48D0), static,
> > <---------------------
> > CISCO, status defined, active
> > Serial0 (up): ip 172.16.3.3 dlci 301(0x12D,0x48D0), dynamic,
> > <----------------
> > broadcast,, status defined, active
> > spoke-2#
> >
> >
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