From: Sergey Golovanov (sergey.golovanov@iementor.com)
Date: Thu Jan 25 2007 - 05:52:36 ART
your arp is failing, which probably means your traffic is not getting from R3 to R4 or from R4 to R3.
Run "debug arp" on R3 and R4. Ping from either end. Which device is not getting ARP messages?
--------------------------------------------------------------------
Sergey Golovanov, CCIEx5 (R&S/Security/Voice/Service Provider/Storage)
"Please, don't ask me for my ccie #, there are reasons why I can't release it"
ieMentor Instructor and Content Developer
sergey.golovanov@iementor.com
http://www.iementor.com
> -------Original Message-------
> From: Michael Zuo <mzuo@ixiacom.com>
> Subject: ICMP showing encapsulation failed
> Sent: Jan 25 '07 02:22
>
> Hi group,
>
>
>
> I am scratching my head on this one (probably something basic), please
> help! And thanks in advance....
>
>
>
>
>
> R3(f0/1)---------(f0/4)CAT1(f0/14)-----------(f0/14)CAT2(f0/5)----------
> -----R4(f0/0)
>
>
>
> When I ping from R3 to R4, I get encapsulation failed message on R3:
>
>
>
> R3(config-if)#do ping 172.16.34.4
>
>
>
> Type escape sequence to abort.
>
> Sending 5, 100-byte ICMP Echos to 172.16.34.4, timeout is 2 seconds:
>
>
>
> 2d07h: IP: tableid=0, s=172.16.34.3 (local), d=172.16.34.4
> (FastEthernet0/1), ro
>
> uted via RIB
>
> 2d07h: IP: s=172.16.34.3 (local), d=172.16.34.4 (FastEthernet0/1), len
> 100, send
>
> ing
>
> 2d07h: IP: s=172.16.34.3 (local), d=172.16.34.4 (FastEthernet0/1), len
> 100, enca
>
> psulation failed.
>
> 2d07h: IP: tableid=0, s=172.16.34.3 (local), d=172.16.34.4
> (FastEthernet0/1), ro
>
> uted via RIB
>
> 2d07h: IP: s=172.16.34.3 (local), d=172.16.34.4 (FastEthernet0/1), len
> 100, send
>
> Ing
>
>
>
>
>
>
>
> Configuration:
>
>
>
> R3:
>
> =======
>
> R3(config-router)#do sh run int f0/1
>
> Building configuration...
>
>
>
> Current configuration : 96 bytes
>
> !
>
> interface FastEthernet0/1
>
> ip address 172.16.34.3 255.255.255.0
>
> duplex auto
>
> speed auto
>
> end
>
>
>
> R3(config-router)#
>
>
>
>
>
> CAT1:
>
> ========
>
> CAT1(config)#do sh run int f0/4
>
> Building configuration...
>
>
>
> Current configuration : 97 bytes
>
> !
>
> interface FastEthernet0/4
>
> switchport access vlan 30
>
> switchport mode access
>
> duplex full
>
> end
>
>
>
> CAT1(config)#do sh run int f0/14
>
> Building configuration...
>
>
>
> Current configuration : 137 bytes
>
> !
>
> interface FastEthernet0/14
>
> switchport trunk encapsulation dot1q
>
> switchport trunk allowed vlan 1,20,30,40
>
> switchport mode trunk
>
>
>
> CAT1(config-if)#do sh run int vlan 30
>
> Building configuration...
>
>
>
> Current configuration : 63 bytes
>
> !
>
> interface Vlan30
>
> ip address 172.16.34.10 255.255.255.0
>
> end
>
>
>
>
>
> CAT2:
>
> CAT2(config-if)#do sh run int f0/5
>
> Building configuration...
>
>
>
> Current configuration : 97 bytes
>
> !
>
> interface FastEthernet0/5
>
> switchport access vlan 30
>
> switchport mode access
>
> duplex full
>
> end
>
>
>
> CAT2(config-if)#do sh run int f0/14
>
> Building configuration...
>
>
>
> Current configuration : 137 bytes
>
> !
>
> interface FastEthernet0/14
>
> switchport trunk encapsulation dot1q
>
> switchport trunk allowed vlan 1,20,30,40
>
> switchport mode trunk
>
> end
>
>
>
> CAT2(config-if)#
>
>
>
>
>
> R4
>
> =======
>
> R4(config-router)#do sh run int f0/0
>
> Building configuration...
>
>
>
> Current configuration : 96 bytes
>
> !
>
> interface FastEthernet0/0
>
> ip address 172.16.34.4 255.255.255.0
>
> duplex auto
>
> speed auto
>
> end
>
>
>
> R4(config-router)#
>
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This archive was generated by hypermail 2.1.4 : Thu Feb 08 2007 - 23:46:57 ART