From: George Cassels (glcassels3@nc.rr.com)
Date: Sun Feb 16 2003 - 12:23:01 GMT-3
Hunt,
With the combination of a multi-point interface at the hub and physical
interface at the spokes....inverse arp would have resolved the mapping
automatically. The mappings would still be present although you have
disabled them by adding a static mapping or the no frame inverse-arp
command, until you clear them. You may want to do a sh frame map command
and see if it says you learned the mapping dynamically. Calow's book has a
great chapter on when and when not to map....
George Cassels
CW2, U.S. Army
CCDP, CCNP, MCSE (4.0, 2000)
G6, XVIII Airborne Corps
----- Original Message -----
From: "Hunt Lee" <ciscoforme3@yahoo.com.au>
To: <ccielab@groupstudy.com>
Sent: Sunday, February 16, 2003 7:53 AM
Subject: Frame-relay mystery
> Hi friends,
>
> I have a little confusion in a very simple FR setup (hub & spoke
topology)... all 3
> are in OSPF (not that I think it would have any affect on this ;)
>
> R3 R5
> \ /
> R1
>
> IP Addressing:
>
> R1 - 137.20.101.1/24
> R3 - 137.20.101.3/24
> R5 - 137.20.101.5/24
>
>
> I don't understand that even if each of my spoke ONLY has a frame-relay
map ip
> statement pointing to the hub (R1), that they somehow can still managed to
ping each
> other!!!
>
> On R1 (hub)
>
> R1#sh run
> Building configuration...
>
> Current configuration : 1868 bytes
> !
> interface Serial0/0
> no ip address
> encapsulation frame-relay
> no ip mroute-cache
> no fair-queue
> !
> interface Serial0/0.1 multipoint
> ip address 137.20.101.1 255.255.255.0
> ip access-group blockR6 in
> ip ospf network point-to-multipoint
> frame-relay map ip 137.20.101.3 103 broadcast
> frame-relay map ip 137.20.101.5 105 broadcast
> no frame-relay inverse-arp
> !
> end
>
> On R3 (spoke)
>
> interface Serial0
> ip address 137.20.101.3 255.255.255.0
> encapsulation frame-relay
> ip ospf network point-to-multipoint
> no ip mroute-cache
> frame-relay map ip 137.20.101.1 301 broadcast
> no frame-relay inverse-arp
> bridge-group 1
> end
>
> On R5 (other spoke)
>
> R5#sh run
> Building configuration...
>
> !
> interface Serial0
> ip address 137.20.101.5 255.255.255.0
> encapsulation frame-relay
> ip ospf network point-to-multipoint
> no fair-queue
> clockrate 64000
> frame-relay map ip 137.20.101.1 501 broadcast
> no frame-relay inverse-arp
> !
> end
>
> R3#ping 137.20.101.5
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 137.20.101.5, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 116/118/128 ms
> R3#
>
> R5#ping 137.20.101.3
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 137.20.101.3, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 116/138/220 ms
> R5#
>
> Yet, I was expecting that the spoke, without the additional frame-relay
map ip
> statement pointing with each other, should not be able to ping each
other... (apart
> from able to ping the hub).
>
> Anyone has any clue on this?
>
> Regards,
> L.
>
>
> http://mobile.yahoo.com.au - Yahoo! Mobile
> - Exchange IMs with Messenger friends on your Telstra or Vodafone mobile
phone.
This archive was generated by hypermail 2.1.4 : Sat Mar 01 2003 - 11:06:25 GMT-3