Re: Arp not getting resolved in case of Bridging over

Hello Sonu -

Here is a working configuration for you.

Simply modify the interface numbers and IP addresses to protect the innocent. :)

R1

conf t

default int ser 0/0

frame-relay switching

bridge 1 protocol ieee

int ser 0/0

no shut

no keep

clock rate 64000

encapsulation frame-relay

serial restart-delay 0

frame-relay map bridge 16 broadcast

frame-relay interface-dlci 16

frame-relay intf-type dce

bridge-group 1

exit

bridge irb

bridge 1 route ip

interface BVI1

ip address 10.0.0.1 255.0.0.0

end

R2

conf t

default int ser 0/0

frame-relay switching

bridge 1 protocol ieee

int ser 0/0

no shut

no keep

clock rate 64000

encapsulation frame-relay

serial restart-delay 0

frame-relay map bridge 16 broadcast

frame-relay interface-dlci 16

frame-relay intf-type dce

bridge-group 1

exit

bridge irb

bridge 1 route ip

interface BVI1

ip address 10.0.0.2 255.0.0.0

end

Best wishes,

Keith H. Barker, CCIE #6783
Instructor
kbarker_at_ine.com
Internetwork Expert, Inc.
http://ine.com
Toll Free: 877-224-8987
Outside US: 775-826-4344

On Jul 31, 2010, at 12:26 AM, Sonu Khandelwal (sokhande) wrote:

> Hi All,
> I have back to back connected routers like this:
>
> R1(se2/0)----(se2/0)R2
>
> I have configured bridging over frame-relay cloud. Its some how not
> working for me. When I try back to back ping for BVI interface, it
> fails. While debugging more I see that arp does not get resolved. On
> enabling debug arp I see following messages. Seems like somehow R2 is
> not getting arp reply which R1 sent.
>
> say I send ping from R2:
>
> message at R2:
>
> R2#ping 60.1.1.1
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 60.1.1.1, timeout is 2 seconds:
>
> *Jul 31 07:08:57.055: IP ARP: creating incomplete entry for IP address:
> 60.1.1.1 interface BVI1
> *Jul 31 07:08:57.055: IP ARP: sent req src 60.1.1.2 0000.0c48.04b0,
> dst 60.1.1.1 0000.0000.0000 BVI1.
> *Jul 31 07:08:59.059: IP ARP: sent req src 60.1.1.2 0000.0c48.04b0,
> dst 60.1.1.1 0000.0000.0000 BVI1.
> *Jul 31 07:09:01.059: IP ARP: sent req src 60.1.1.2 0000.0c48.04b0,
> dst 60.1.1.1 0000.0000.0000 BVI1.
> *Jul 31 07:09:03.059: IP ARP: sent req src 60.1.1.2 0000.0c48.04b0,
> dst 60.1.1.1 0000.0000.0000 BVI1.
> *Jul 31 07:09:05.059: IP ARP: sent req src 60.1.1.2 0000.0c48.04b0,
> dst 60.1.1.1 0000.0000.0000 BVI1.
> Success rate is 0 percent (0/5)
> R2#
>
>
> Message at R1:
>
> R1#
> *Jul 31 07:08:57.211: IP ARP: rcvd req src 60.1.1.2 0000.0c48.04b0, dst
> 60.1.1.1 BVI1
> *Jul 31 07:08:57.211: IP ARP: creating entry for IP address: 60.1.1.2,
> hw: 0000.0c48.04b0
> *Jul 31 07:08:57.211: IP ARP: sent rep src 60.1.1.1 0000.0c31.0448,
> dst 60.1.1.2 0000.0c48.04b0 BVI1
> R1#
> *Jul 31 07:08:59.211: IP ARP: rcvd req src 60.1.1.2 0000.0c48.04b0, dst
> 60.1.1.1 BVI1
> *Jul 31 07:08:59.211: IP ARP: sent rep src 60.1.1.1 0000.0c31.0448,
> dst 60.1.1.2 0000.0c48.04b0 BVI1
> R1#
> *Jul 31 07:09:01.211: IP ARP: rcvd req src 60.1.1.2 0000.0c48.04b0, dst
> 60.1.1.1 BVI1
> *Jul 31 07:09:01.211: IP ARP: sent rep src 60.1.1.1 0000.0c31.0448,
> dst 60.1.1.2 0000.0c48.04b0 BVI1
> R1#
> *Jul 31 07:09:03.211: IP ARP: rcvd req src 60.1.1.2 0000.0c48.04b0, dst
> 60.1.1.1 BVI1
> *Jul 31 07:09:03.211: IP ARP: sent rep src 60.1.1.1 0000.0c31.0448,
> dst 60.1.1.2 0000.0c48.04b0 BVI1
> R1#
> *Jul 31 07:09:05.211: IP ARP: rcvd req src 60.1.1.2 0000.0c48.04b0, dst
> 60.1.1.1 BVI1
> *Jul 31 07:09:05.211: IP ARP: sent rep src 60.1.1.1 0000.0c31.0448,
> dst 60.1.1.2 0000.0c48.04b0 BVI1
> R1#
>
>
> configs from R1:
>
> R1#sh run int se 2/0
> Building configuration...
>
> Current configuration : 233 bytes
> !
> interface Serial2/0
> no ip address
> encapsulation frame-relay
> ipv6 ospf network broadcast
> serial restart-delay 0
> frame-relay map bridge 16 broadcast
> frame-relay interface-dlci 16
> frame-relay intf-type dce
> bridge-group 1
> end
>
> R1#sh run | sec bridge
> bridge irb
> frame-relay map bridge 16 broadcast
> bridge-group 1
> bridge 1 protocol ieee
> bridge 1 route ip
> R1#
>
> R1#sh run int bv1
> Building configuration...
>
> Current configuration : 57 bytes
> !
> interface BVI1
> ip address 60.1.1.1 255.255.255.0
> end
>
> R1#
>
> configs from R2:
>
> R2#sh run int se 2/0
> Building configuration...
>
> Current configuration : 208 bytes
> !
> interface Serial2/0
> no ip address
> encapsulation frame-relay
> serial restart-delay 0
> frame-relay map bridge 16 broadcast
> frame-relay interface-dlci 16
> frame-relay interface-dlci 17
> bridge-group 1
> end
>
> R2#sh run | sec bridge
> bridge irb
> frame-relay map bridge 16 broadcast
> bridge-group 1
> bridge 1 protocol ieee
> R2#
>
> R2#sh run int bvi1
> Building configuration...
>
> Current configuration : 57 bytes
> !
> interface BVI1
> ip address 60.1.1.2 255.255.255.0
> end
>
> R2#
>
>
> Frame-relay Map:
>
> R1#sfm
> Serial2/0 (up): bridge dlci 16(0x10,0x400), static,
> broadcast,
> CISCO, status defined, active
> R1#
>
> R2#sfm
> Serial2/0 (up): bridge dlci 16(0x10,0x400), static,
> broadcast,
> CISCO, status defined, active
> R2#
>
>
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Received on Sat Jul 31 2010 - 12:53:55 ART