Frame Relay: dynamic map created even when arp is disabled.
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04-20-2006 09:04 AM - edited 03-03-2019 12:27 PM
I am studying for the CCIE R&S lab exam after having successfully passed the written. I just completed physically setting up my lab and am now working through various study material. I am currently working through Solie's "CCIE Practical Studies volume 1" and have run into some problems with Lab 13 on page 370.
Routers scotts_house and mini_me are creating dynamic mappings to starbucks_90210 even though I have configured the serial interfaces with "no frame-relay inverse-arp" and "no arp frame-relay". I have issued "clear frame-relay inarp" but the mappings eventually return. I have rebooted the routers but the mappings eventually appear.
Here are the partial configs. r2 is scotts_house. r3 is mini_me and r4 is starbucks_90210.
r2#sh run int s0/0/0
Building configuration...
Current configuration : 212 bytes
!
interface Serial0/0/0
ip address 10.10.1.10 255.255.255.248
encapsulation frame-relay
no arp frame-relay
frame-relay map ip 10.10.1.9 201
frame-relay map ip 10.10.1.11 201
no frame-relay inverse-arp
end
r2#sh fram map
Serial0/0/0 (up): ip 10.10.1.9 dlci 201(0xC9,0x3090), static,
CISCO, status defined, active
Serial0/0/0 (up): ip 10.10.1.11 dlci 201(0xC9,0x3090), static,
CISCO, status defined, active
Serial0/0/0 (up): ip 192.168.1.6 dlci 204(0xCC,0x30C0), dynamic,
broadcast,
CISCO, status defined, active
r3#sh run int s0/0/0
Building configuration...
Current configuration : 212 bytes
!
interface Serial0/0/0
ip address 10.10.1.11 255.255.255.248
encapsulation frame-relay
no arp frame-relay
frame-relay map ip 10.10.1.9 301
frame-relay map ip 10.10.1.10 301
no frame-relay inverse-arp
end
r3#sh fram map
Serial0/0/0 (up): ip 10.10.1.9 dlci 301(0x12D,0x48D0), static,
CISCO, status defined, active
Serial0/0/0 (up): ip 10.10.1.10 dlci 301(0x12D,0x48D0), static,
CISCO, status defined, active
Serial0/0/0 (up): ip 192.168.1.6 dlci 304(0x130,0x4C00), dynamic,
broadcast,
CISCO, status defined, active
r4#sh run int s0/0/0
Building configuration...
Current configuration : 143 bytes
!
interface Serial0/0/0
ip address 192.168.1.6 255.255.255.252
encapsulation frame-relay
no fair-queue
frame-relay interface-dlci 401
end
r4#sh fram map
Serial0/0/0 (up): ip 10.10.1.10 dlci 402(0x192,0x6420), dynamic,
broadcast,
CISCO, status defined, active
Serial0/0/0 (up): ip 10.10.1.11 dlci 403(0x193,0x6430), dynamic,
broadcast,
CISCO, status defined, active
Serial0/0/0 (up): ip 192.168.1.5 dlci 401(0x191,0x6410), dynamic,
broadcast,
CISCO, status defined, active
Any help would be appreciated and all posts will be rated.
thanks
Bruno
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04-20-2006 09:35 AM
Bruno,
I believe the problem you are seeing here is that the InvARP entries have been created before you configured the frame-relay map statements. Therefore, issue the 'clear frame-relay inarp' command to clear those entries.
The entries will no longer be created the next time you reload the router.
Hope that helps - pls do remember to rate posts that help.
Paresh
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04-20-2006 09:36 AM
One other thing, the 'no arp frame-relay' does not impact Inverse-ARP at all so it's really redundant config.
Paresh
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04-20-2006 10:59 AM
Paresh,
I have issued 'clear frame-relay inarp' but the dynamic mappings keep returning. I have gone so far as to erase the nvram, re-configure the interfaces w/ "no frame-relay inverse-arp" and then issued a "no shut" and the dynamic mappings still appear.
I have gone to the starbucks_90210 router and entered "no frame-relay inverse-arp IP 402" and "no frame-relay inverse-arp IP 403" on the serial interface and now the dynamic mappings do not happen.
Does inverse-arp need to be disabled at both ends? I would have thought that disabling on one router would make that router not create dynamic maps.
Bruno
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04-20-2006 02:30 PM
Bruno,
I should have mentioned that it needs to be disabled at both ends.
Even if one end has inv-arp disabled, that does not stop it listening to and responding to InvARPs received from the other end.
Remove it at both ends and you will be right.
Paresh
