From: Nick Shah (nshah@xxxxxxxxxxxxxx)
Date: Wed Jan 09 2002 - 02:09:57 GMT-3
this happens when u have 2 paths to same destination, and it tries to do per
packet load balancing.
Prima facie, i see some duplicate address on Serial0 and Serial0.1 (both
seem to have 10.10.1.1).
Nick
----- Original Message -----
From: "Kohli, Harbir" <harbir.kohli@bellnexxia.com>
To: <ccielab@groupstudy.com>
Cc: <mrussell@ccbootcamp.com>
Sent: Wednesday, January 09, 2002 3:36 PM
Subject: RE: CCBOOTCAMP LAB 1
> Hi,
>
> I am trying a variant of the bootcamp lab 1 and am seeing some interesting
> behaviour.
>
> Every alternate ping to R2 from R1 fails with an encapsulation failure.
It
> should either have a map or it should not. Also I see failure with
> broadcasts.
>
> Note, if I put in a route to 10.10.1.2 pointing out s0.1 all pings make it
> thorough.
>
> Why? Also I see some broadcast failures, why ?
>
> ******************ERROR*******************
> R1#ping 10.10.1.2
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.10.1.2, timeout is 2 seconds:
> .!.!.
> Success rate is 40 percent (2/5), round-trip min/avg/max = 36/36/36 ms
> R1#
> *Feb 28 19:02:52.379 est: IP: s=10.10.1.1 (local), d=10.10.1.2 (Serial0),
> len 100, sending
> *Feb 28 19:02:52.383 est: Serial0:Encaps failed--no map entry link 7(IP)
> *Feb 28 19:02:52.387 est: IP: s=10.10.1.1 (local), d=10.10.1.2 (Serial0),
> len 100, encapsulation failed
> *Feb 28 19:02:54.375 est: IP: s=10.10.1.1 (local), d=10.10.1.2
(Serial0.1),
> len 100, sending
> *Feb 28 19:02:54.379 est: Serial0.1(o): dlci 102(0x1861), pkt type
> 0x800(IP), datagramsize 104
> *Feb 28 19:02:54.403 est: Serial0(i): dlci 102(0x1861), pkt type 0x800,
> datagramsize 104
> *Feb 28 19:02:54.407 est: IP: s=10.10.1.2 (Serial0.1), d=10.10.1.1, len
100,
> rcvd 2
> *Feb 28 19:02:54.415 est: IP: s=10.10.1.1 (local), d=10.10.1.2 (Serial0),
> len 100, sending
> *Feb 28 19:02:54.419 est: Serial0:Encaps failed--no map entry link 7(IP)
> *Feb 28 19:02:54.423 est: IP: s=10.10.1.1 (local), d=10.10.1.2 (Serial0),
> len 100, encapsulation failed
> *Feb 28 19:02:56.415 est: IP: s=10.10.1.1 (local), d=10.10.1.2
(Serial0.1),
> len 100, sending
> R
> *Feb 28 19:02:56.419 est: Serial0.1(o): dlci 102(0x1861), pkt type
> 0x800(IP), datagramsize 104
> *Feb 28 19:02:56.443 est: Serial0(i): dlci 102(0x1861), pkt type 0x800,
> datagramsize 104
> *Feb 28 19:02:56.447 est: IP: s=10.10.1.2 (Serial0.1), d=10.10.1.1, len
100,
> rcvd 2
> *Feb 28 19:02:56.455 est: IP: s=10.10.1.1 (local), d=10.10.1.2 (Serial0),
> len 100, sending
> *Feb 28 19:02:56.459 est: Serial0:Encaps failed--no map entry link 7(IP)
> *Feb 28 19:02:56.463 est: IP: s=10.10.1.1 (local), d=10.10.1.2 (Serial0),
> len 100, encapsulation failed
> *Feb 28 19:02:57.395 est: IP: s=10.1.1.1 (local), d=255.255.255.255
> (Ethernet0), len 604, sending broad/multicast
> *Feb 28 19:02:57.403 est: IP: s=201.201.201.1 (local), d=255.255.255.255
> (Loopback0), len 604, sending broad/multicast
> *Feb 28 19:02:57.407 est: IP: s=10.10.1.1 (local), d=255.255.255.255
> (Serial0), len 604, sending broad/multicast
> *Feb 28 19:02:57.415 est: Serial0: broadcast search
> *Feb 28 19:02:57.415 est: Serial0:encaps failed on broadcast for link
7(IP)
> *Feb 28 19:02:57.419 est: IP: s=10.10.1.1 (local), d=255.255.255.255
> (Serial0), len 604, encapsulation failed
> *Feb 28 19:02:57.423 est: IP: s=10.10.1.1 (local), d=255.255.255.255
> (Serial0.1), len 604, sending broad/multicast
> *Feb 28 19:02:57.431 est: Serial0.1: broadcast search
> *Feb 28 19:02:57.431 est: Serial0.1:encaps failed on broadcast for link
> 7(IP)
> *Feb 28 19:02:57.435 est: IP: s=
>
>
> R1#ping 10.10.1.2
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.10.1.2, timeout is 2 seconds:
> !.!.!
> Success rate is 60 percent (3/5), round-trip min/avg/max = 36/36/36 ms
> R1#
> *Feb 28 19:13:15.307 est: IP: s=10.10.1.1 (local), d=10.10.1.2
(Serial0.1),
> len 100, sending
> *Feb 28 19:13:15.311 est: Serial0.1(o): dlci 102(0x1861), pkt type
> 0x800(IP), datagramsize 104
> *Feb 28 19:13:15.335 est: Serial0(i): dlci 102(0x1861), pkt type 0x800,
> datagramsize 104
> *Feb 28 19:13:15.339 est: IP: s=10.10.1.2 (Serial0.1), d=10.10.1.1, len
100,
> rcvd 2
> *Feb 28 19:13:15.347 est: IP: s=10.10.1.1 (local), d=10.10.1.2 (Serial0),
> len 100, sending
> *Feb 28 19:13:15.351 est: Serial0:Encaps failed--no map entry link 7(IP)
> *Feb 28 19:13:15.355 est: IP: s=10.10.1.1 (local), d=10.10.1.2 (Serial0),
> len 100, encapsulation failed
> *Feb 28 19:13:17.347 est: IP: s=10.10.1.1 (local), d=10.10.1.2
(Serial0.1),
> len 100, sending
> *Feb 28 19:13:17.351 est: Serial0.1(o): dlci 102(0x1861), pkt type
> 0x800(IP), datagramsize 104
> *Feb 28 19:13:17.375 est: Serial0(i): dlci 102(0x1861), pkt type 0x800,
> datagramsize 104
> *Feb 28 19:13:17.379 est: IP: s=10.10.1.2 (Serial0.1), d=10.10.1.1, len
100,
> rcvd 2
> *Feb 28 19:13:17.387 est: IP: s=10.10.1.1 (local), d=10.10.1.2 (Serial0),
> len 100, sending
> *Feb 28 19:13:17.391 est: Serial0:Encaps failed--no map entry link 7(IP)
> *Feb 28 19:13:17.395 est: IP: s=10.10.1.1 (local), d=10.10.1.2 (Serial0),
> len 100, encapsulation failed
> *Feb 28 19:13:19.387 est: IP: s=10.10.1.1 (local), d=10.10.1.2
(Serial0.1),
> len 100, sending
> *Feb 28 19:13:19.391 est: Serial0.1(o): dlci 102(0x1861), pkt type
> 0x800(IP), datagramsize 104
> *Feb 28 19:13:19.415 est: Serial0(i): dlci 102(0x1861), pkt type 0x800,
> datagramsize 104
> *Feb 28 19:13:19.419 est: IP: s=10.10.1.2 (Serial0.1), d=10.10.1.1, len
100,
> rcvd 2
>
> R1#
> R1#c
> Enter configuration commands, one per line. End with CNTL/Z.
> R1(config)# ip route 10.10.1.2 255.255.255.255 serial 0.1
> R1(config)#^Z
> R1#ping 10.10.1.2
> *Feb 28 19:13:36.259 est: %SYS-5-CONFIG_I: Configured from console by
> console
> R1#ping 10.10.1.2
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.10.1.2, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 36/39/40 ms
> R1#
> *Feb 28 19:13:38.367 est: IP: s=10.10.1.1 (local), d=10.10.1.2
(Serial0.1),
> len 100, sending
> *Feb 28 19:13:38.371 est: Serial0.1(o): dlci 102(0x1861), pkt type
> 0x800(IP), datagramsize 104
> *Feb 28 19:13:38.395 est: Serial0(i): dlci 102(0x1861), pkt type 0x800,
> datagramsize 104
> *Feb 28 19:13:38.399 est: IP: s=10.10.1.2 (Serial0.1), d=10.10.1.1, len
100,
> rcvd 2
> *Feb 28 19:13:38.407 est: IP: s=10.10.1.1 (local), d=10.10.1.2
(Serial0.1),
> len 100, sending
> *Feb 28 19:13:38.411 est: Serial0.1(o): dlci 102(0x1861), pkt type
> 0x800(IP), datagramsize 104
> *Feb 28 19:13:38.435 est: Serial0(i): dlci 102(0x1861), pkt type 0x800,
> datagramsize 104
> *Feb 28 19:13:38.439 est: IP: s=10.10.1.2 (Serial0.1), d=10.10.1.1, len
100,
> rcvd 2
> *Feb 28 19:13:38.447 est: IP: s=10.10.1.1 (local), d=10.10.1.2
(Serial0.1),
> len 100, sending
> *Feb 28 19:13:38.451 est: Serial0.1(o): dlci 102(0x1861), pkt type
> 0x800(IP), datagramsize 104
> *Feb 28 19:13:38.479 est: Serial0(i): dlci 102(0x1861), pkt type 0x800,
> datagramsize 104
> *Feb 28 19:13:38.483 est: IP: s=10.10.1.2 (Serial0.1), d=10.10.1.1, len
100,
> rcvd 2
> *Feb 28 19:13:38.487 est: IP: s=10.10.1.1 (local), d=10.10.1.2
(Serial0.1),
> len 100, sending
> *Feb 28 19:13:38.495 est: Serial0.1(o): dlci 102(0x1861), pkt type
> 0x800(IP), datagramsize 104
> *Feb 28 19:13:38.519 est: Serial0(i): dlci 102(0x1861), pkt type 0x800,
> datagramsize 104
> *Feb 28 19:13:38.523 est: IP: s=10.10.1.2 (Serial0.1), d=10.10.1.1, len
100,
> rcvd 2
> *Feb 28 19:13:38.531 est: IP: s=10.10.1.1 (local), d=10.10.1.2
(Serial0.1),
> len 100, sending
> *Feb 28 19:13:38.535 est: Serial0.1(o): dlci 102(0x1861), pkt type
> 0x800(IP), datagramsize 104
> *Feb 28 19:13:38.559 est: Serial0(i): dlci 102(0x1861), pkt type 0x800,
> datagramsize 104
> *Feb 28 19:13:38.563 est: IP: s=10.10.1.2 (Serial0.1), d=10.10.1.1, len
100,
> rcvd 2
> ***********************************Configs
> R1#sr
> Building configuration...
>
> Current configuration : 1412 bytes
> !
> version 12.1
> service timestamps debug datetime msec localtime show-timezone
> service timestamps log datetime msec localtime show-timezone
> no service password-encryption
> !
> hostname R1
> !
> enable password cisco
> !
> !
> !
> !
> !
> clock timezone est -5
> clock summer-time edt recurring
> ip subnet-zero
> no ip finger
> no ip domain-lookup
> !
> cns event-service server
> !
> !
> !
> interface Loopback0
> ip address 201.201.201.1 255.255.255.0
> !
> interface Ethernet0
> ip address 10.1.1.1 255.255.0.0
> !
> interface Serial0
> ip address 10.10.1.1 255.255.0.0
> encapsulation frame-relay
> ip ospf hello-interval 10
> no fair-queue
> no frame-relay inverse-arp
> !
> interface Serial0.1 multipoint
> ip address 10.10.1.1 255.255.0.0
> ip ospf hello-interval 10
> frame-relay map ip 10.10.1.2 102
> frame-relay map ip 10.10.1.3 103
> frame-relay map ip 10.10.1.5 105
> no frame-relay inverse-arp
> !
> interface Serial1
> no ip address
> encapsulation frame-relay
> !
> ip classless
> ip route 10.10.1.2 255.255.255.255 Serial0.1
> no ip http server
> !
> !
> alias exec ro show ip route
> alias exec o show ip ospf
> alias exec ix show ipx route
> alias exec int show ip int brief
> alias exec c conf terminal
> alias exec sr show run
> alias exec pvc show frame pvc
> !
> line con 0
> exec-timeout 3600 0
> password cisco
> logging synchronous
> transport input none
> line aux 0
> exec-timeout 3600 0
> password cisco
> transport input telnet
> line vty 0 4
> exec-timeout 3600 0
> password cisco
> login
> !
> end
> ***************************************************R2
> R2#sh run
> Building configuration...
>
> Current configuration : 1215 bytes
> !
> version 12.1
> service timestamps debug datetime msec localtime show-timezone
> service timestamps log datetime msec localtime show-timezone
> no service password-encryption
> !
> hostname R2
> !
> enable password cisco
> !
> !
> !
> !
> !
> clock timezone est -5
> clock summer-time edt recurring
> ip subnet-zero
> no ip finger
> no ip domain-lookup
> !
> cns event-service server
> !
> !
> !
> interface Loopback0
> ip address 200.200.200.1 255.255.255.0
> !
> interface Loopback1
> ip address 220.20.20.1 255.255.255.0
> !
> interface Ethernet0
> ip address 137.20.20.1 255.255.255.0
> !
> interface Serial0
> ip address 10.10.1.2 255.255.0.0
> encapsulation frame-relay
> ip ospf hello-interval 10
> no fair-queue
> frame-relay map ip 10.10.1.1 201
> no frame-relay inverse-arp
> !
> interface Serial1
> no ip address
> !
> ip classless
> no ip http server
> !
> !
> alias exec ro show ip route
> alias exec o show ip ospf
> alias exec ix show ipx route
> alias exec int show ip int brief
> alias exec c conf terminal
> alias exec sr show run
> alias exec pvc show frame pvc
> !
> line con 0
> exec-timeout 3600 0
> password cisco
> logging synchronous
> transport input none
> line aux 0
> exec-timeout 3600 0
> password cisco
> transport input telnet
> line vty 0 4
> exec-timeout 3600 0
> password cisco
> login
> !
> end
>
> R2#
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