From: Schulz, Dave (DSchulz@dpsciences.com)
Date: Sat Jan 28 2006 - 12:32:00 GMT-3
I was doing some experimenting on frame (no specific labs)...and ran into an
interesting debug that I cannot quite explain....
a hub router is set as this:
!
interface Serial1/0
ip address 10.1.1.1 255.255.255.0
encapsulation frame-relay
end
Now, configure a remote router as:
interface Serial0
no ip address
encapsulation frame-relay
end
Here is the debug at the hub, when the remote is turned on......
*Jan 28 08:07:52.225: Serial1/0(o): dlci 104(0x1881), pkt encaps 0x0300 0x8000
0x0000 0x806 (ARP), datagramsize 34
*Jan 28 08:07:52.229: FR: Sending INARP Request on interface Serial1/0 dlci
104 for link 7(IP)
*Jan 28 08:07:52.269: broadcast dequeue
*Jan 28 08:07:52.269: Serial1/0(o):Pkt sent on dlci 104(0x1881), pkt encaps
0x300 0x8000 0x0 0x806 (ARP), datagramsize 34
I know that we have had a number of discussions on GS regarding there not
being ARP on frame....however, the first command shows that a packet is
received on the interface at the hub, which causes the hub router to begin
sending inverse arp. Can someone comment on this packet? All this to ask the
question (sorry).
However, then.....
when I configure the IP at the remote, everything comes together.....as it
should with the inverse arp request/replies....
At the remote:
*Mar 1 19:30:44.115: Serial0(i): dlci 401(0x6411), pkt encaps 0x0300 0x8000
0x0000 0x806 (ARP), datagramsize 34
*Mar 1 19:30:44.119: Serial0: frame relay INARP received
R4(config-if)#ip add 10.1.1.4 255.255.255.0
R4(config-if)#
*Mar 1 19:31:25.255: Serial0(o): dlci 401(0x6411), pkt encaps 0x0300 0x8000
0x0000 0x806 (ARP), datagramsize 34
*Mar 1 19:31:25.259: FR: Sending INARP Request on interface Serial0 dlci 401
for link 7(IP)
*Mar 1 19:31:25.263: Serial0(o): dlci 403(0x6431), pkt encaps 0x0300 0x8000
0x0000 0x806 (ARP), datagramsize 34
*Mar 1 19:31:25.267: FR: Sending INARP Request on interface Serial0 dlci 403
for link 7(IP)
*Mar 1 19:31:25.271: Serial0(o): dlci 402(0x6421), pkt encaps 0x0300 0x8000
0x0000 0x806 (ARP), datagramsize 34
*Mar 1 19:31:25.275: FR: Sending INARP Request on interface Serial0 dlci 402
for link 7(IP)
*Mar 1 19:31:25.307: broadcast dequeue
*Mar 1 19:31:25.307: Serial0(o):Pkt sent on dlci 401(0x6411), pkt encaps
0x300 0x8000 0x0 0x806 (ARP), datagramsize 34
*Mar 1 19:31:25.311: broadcast dequeue
*Mar 1 19:31:25.311: Serial0(o):Pkt sent on dlci 403(0x6431), pkt encaps
0x300 0x8000 0x0 0x806 (ARP), datagramsize 34
*Mar 1 19:31:25.315: broadcast dequeue
*Mar 1 19:31:25.319: Serial0(o):Pkt sent on dlci 402(0x6421), pkt encaps
0x300 0x8000 0x0 0x806 (ARP), datagramsize 34
*Mar 1 19:31:25.331: Serial0(i): dlci 401(0x6411), pkt encaps 0x0300 0x8000
0x0000 0x806 (ARP), datagramsize 34
*Mar 1 19:31:25.335: Serial0: frame relay INARP received
*Mar 1 19:31:25.351: Serial0(i): dlci 403(0x6431), pkt encaps 0x0300 0x8000
0x0000 0x806 (ARP), datagramsize 34
*Mar 1 19:31:25.355: Serial0(i): dlci 402(0x6421), pkt encaps 0x0300 0x8000
0x0000 0x806 (ARP), datagramsize 34
*Mar 1 19:31:25.363: Serial0: frame relay INARP received
*Mar 1 19:31:25.363: Serial0: frame relay INARP received
R4(config-if)#end
R4#sh fr
*Mar 1 19:32:31.331: %SYS-5-CONFIG_I: Configured from console by consoleam
map
Serial0 (up): ip 10.1.1.1 dlci 401(0x191,0x6410), dynamic,
broadcast,, status defined, active
Serial0 (up): ip 10.1.1.2 dlci 402(0x192,0x6420), dynamic,
At the host:
*Jan 28 08:40:21.481: Serial1/0(o): dlci 104(0x1881), pkt encaps 0x0300 0x8000
0x0000 0x806 (ARP), datagramsize 34
*Jan 28 08:40:21.481: FR: Sending INARP Request on interface Serial1/0 dlci
104 for link 7(IP)
*Jan 28 08:40:21.521: broadcast dequeue
*Jan 28 08:40:21.521: Serial1/0(o):Pkt sent on dlci 104(0x1881), pkt encaps
0x300 0x8000 0x0 0x806 (ARP), datagramsize 34
*Jan 28 08:40:21.549: Serial1/0(i): dlci 104(0x1881), pkt encaps 0x0300 0x8000
0x0000 0x806 (ARP), datagramsize 34
*Jan 28 08:40:21.549: Serial1/0: frame relay INARP received
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