From: Bit Gossip (bit.gossip@chello.nl)
Date: Fri Jul 27 2007 - 15:52:02 ART
Nagendra,
I think that it is not a lecit configuration using the same subnet accross
two interfaces, whether they are p2p or not.
In this case if R1 wants to send a packet to R2 it has no way to know out of
which subinterface to send it out from. This trace is very clear: it tries
to send to R2 but it guesses the wrong subinterface and so it sends the
packet to R4 :-)
Bit.
R1#debug ip packet
IP packet debugging is on
R1#ping 172.16.124.2 repeat 1
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 172.16.124.2, timeout is 2 seconds:
*Mar 1 00:04:22.035: IP: tableid=0, s=172.16.124.1 (local), d=172.16.124.2
(Serial0/0.101), routed via FIB
*Mar 1 00:04:22.035: IP: s=172.16.124.1 (local), d=172.16.124.2
(Serial0/0.101), len 100, sending
*Mar 1 00:04:22.059: IP: s=172.16.124.4 (Serial0/0.101), d=172.16.124.1,
len 56, rcvd 2.
Success rate is 0 percent (0/1)
----- Original Message -----
From: "nagendra kumar" <nagendranainar@yahoo.co.in>
To: <ccielab@groupstudy.com>
Sent: Friday, July 27, 2007 11:50 AM
Subject: Frame-relay subinterface with same subnet
> Hi All,
>
> R1
> (172.16.124.1/24) - DLCI 104 | (172.16.124.3/24) - DLCI 102
> |
> R4---------FRSW-----------R2
> (172.16.124.2/24) - DLCI 201
> (172.16.124.4/24) - DLCI 401
>
> In the above mentioned topology, I have to configure 2 sub interface in
> R1 one to R4 and other to R2 with ip addr from same subnet. The solution
> seems to have configured with point-to-point subinterface in R1 physical
> interface in other routers.
>
> But when I try it in my setup, I am missing alternate packets. I have
> copied the configs below. Can some one throw more lights on how to solve
> this issue.
>
> Configuration:
> ===========
> R1#sh run int s5/0.101
> Building configuration...
>
> Current configuration : 120 bytes
> !
> interface Serial5/0.101 point-to-point
> ip address 172.16.124.1 255.255.255.0
> frame-relay interface-dlci 104
> end
>
> R1#sh run int s5/0.102
> Building configuration...
>
> Current configuration : 120 bytes
> !
> interface Serial5/0.102 point-to-point
> ip address 172.16.124.3 255.255.255.0
> frame-relay interface-dlci 102
> end
>
> R1#sh fram pvc 104 | inc STAT
> DLCI = 104, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE =
> Serial5/0.101
> R1#sh fram pvc 102 | inc STAT
> DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE =
> Serial5/0.102
> R1#ping 172.16.124.4
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 172.16.124.4, timeout is 2 seconds:
> !.!.!
> Success rate is 60 percent (3/5), round-trip min/avg/max = 40/40/40 ms
> R1#
> R1#sh fram map
> Serial5/0.101 (up): point-to-point dlci, dlci 104(0x68,0x1880), broadcast
> status defined, active
> Serial5/0.102 (up): point-to-point dlci, dlci 102(0x66,0x1860), broadcast
> status defined, active
> R1#
>
> R4#sh run int s5/0
> Building configuration...
>
> Current configuration : 335 bytes
> !
> interface Serial5/0
> ip address 172.16.124.4 255.255.255.0
> encapsulation frame-relay
> serial restart-delay 0
> no dce-terminal-timing-enable
> frame-relay map ip 172.16.124.1 401 broadcast
> no frame-relay inverse-arp IP 402
> no frame-relay inverse-arp IP 403
> no frame-relay inverse-arp IP 405
> no frame-relay inverse-arp IP 502
> end
>
> R4#sh fram pvc | inc 401
> DLCI = 401, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE =
> Serial5/0
> R4#sh fram map
> Serial5/0 (up): ip 172.16.124.1 dlci 401(0x191,0x6410), static,
> broadcast,
> CISCO, status defined, active
> R4#
>
> R2#
> R2#sh run int s5/0
> Building configuration...
>
> Current configuration : 300 bytes
> !
> interface Serial5/0
> ip address 172.16.124.2 255.255.255.0
> encapsulation frame-relay
> serial restart-delay 0
> no dce-terminal-timing-enable
> frame-relay map ip 172.16.124.3 201 broadcast
> no frame-relay inverse-arp IP 203
> no frame-relay inverse-arp IP 204
> no frame-relay inverse-arp IP 213
> end
>
> R2#sh fram pvc | inc 201
> DLCI = 201, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE =
> Serial5/0
> R2#sh fram map
> Serial4/3 (up): ip 172.16.25.5 dlci 205(0xCD,0x30D0), dynamic,
> broadcast,
> CISCO, status defined, active
> Serial5/0 (up): ip 172.16.124.3 dlci 201(0xC9,0x3090), static,
> broadcast,
> CISCO, status defined, active
> R2#
>
> Am I missing something here?
>
> Regards,
> Nagendra
>
>
>
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This archive was generated by hypermail 2.1.4 : Sat Aug 18 2007 - 08:17:42 ART