From: Scott Strobeck (scott@strobeck.net)
Date: Sun Aug 10 2008 - 14:51:27 ART
John,
"no frame-relay inverse-arp" keeps the interface from sending arp
requests out. It doesn't, however, keep the router from creating
dynamic mappings based on incoming arp requests. (Or at least it maps
based on somthing, . . I assume it's incoming arp requests.)
Anyway, try disabling inverse arp on only one side of a FR link and
clear the inarp, then bounce the opposite end and watch the map reappear
on the side with inarp disabled. . . .
I got bit by this on a mock lab and it makes a very good point. IF IN
YOUR LAB YOU ARE USING DYNAMIC MAPPINGS, DISABLE INVERSE ARP ON ALL
OTHER DLCI'S. If you don't, you may end up with dynamic mappings
elsewhere in your lab you didn't even expect. After setting up all your
frame relay in your lab, I STRONGLY suggest issuing "show frame-relay
map" on EVERY router running FR to make sure you don't have unwanted
dynamic mappings. YOU WILL LOSE POINT FOR THIS!
Scott
John wrote:
> Maybe someone can explain this to me. I enterd the no frame inverse commands
> and reloaded the router. When I do a show frame map it appears that I have
> gotten rid of the unwanted dynamic mappings. When I do a sh frame pvc | inc
> dlci. I see dlci's that should not be there because of the no frame inv
> commands. Why is this???
>
>
> interface Serial0/0/0
> ip address 54.4.2.6 255.255.255.0
> encapsulation frame-relay
> no frame-relay inverse-arp IP 61
> no frame-relay inverse-arp IP 63
> no frame-relay inverse-arp IP 601
> no frame-relay inverse-arp IP 604
> no frame-relay inverse-arp IP 605
> no frame-relay inverse-arp IP 621
> no frame-relay inverse-arp IP 624
> no frame-relay inverse-arp IP 625
> end
>
> R6(config-router)#DO SH FRAME MAP
> Serial0/0/0 (up): ip 54.4.2.254 dlci 62(0x3E,0xCE0), dynamic,
> broadcast,, status defined, active
> R6(config-router)#DO SH FRAME PVC | INC DLCI
> DLCI = 61, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 62, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 63, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 64, DLCI USAGE = UNUSED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 65, DLCI USAGE = UNUSED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 66, DLCI USAGE = UNUSED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 601, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 602, DLCI USAGE = UNUSED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 603, DLCI USAGE = UNUSED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 604, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 605, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 607, DLCI USAGE = UNUSED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 608, DLCI USAGE = UNUSED, PVC STATUS = INACTIVE, INTERFACE =
> Serial0/0/0
> DLCI = 609, DLCI USAGE = UNUSED, PVC STATUS = INACTIVE, INTERFACE =
> Serial0/0/0
> DLCI = 613, DLCI USAGE = UNUSED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 621, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 622, DLCI USAGE = UNUSED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 623, DLCI USAGE = UNUSED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 624, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 625, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 627, DLCI USAGE = UNUSED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> DLCI = 628, DLCI USAGE = UNUSED, PVC STATUS = INACTIVE, INTERFACE =
> Serial0/0/0
> DLCI = 629, DLCI USAGE = UNUSED, PVC STATUS = INACTIVE, INTERFACE =
> Serial0/0/0
> DLCI = 633, DLCI USAGE = UNUSED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
> R6(config-router)#
>
>
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