From: Tarun Pahuja (pahujat@gmail.com)
Date: Sun Nov 11 2007 - 16:14:39 ART
In Future if you run into a problem like this where you have a switch or
switches inbetween routers and you are unable to communicate between the
routers. Try creating an temporary SVI interface on the switches on the same
vlan as the router interface to check if it is a local problem between the
switch and the router or something else.
R1-----SW1----SW2---R2
If you are unable to ping between R1 and R2 and lets say that both are in
vlan 10. I would create a temporary svi interface in vlan 10 on SW1 and SW2.
If i can not ping from SW1 svi interface to the router R1, that means the
problem is local(between SW1 and R1).
If i can not ping from SW1 svi interface to SW2 svi interface, the problem
is related to the trunk.
If I can not ping from SW2 svi to R2, the problem is local(between SW2 and
R2).
You can apply the same concept even if the routers were in different vlans,
where one of the problems could be intervlan routing if the ping did not go
through in addition to all the others I have listed in this thread.
HTH,
Tarun
On Nov 11, 2007 2:03 PM, Ernst Pelser <e.pelser@infosecureltd.com> wrote:
> Tarun
> AAArrrgghh! I knew this but kind of forgot. Well we learn don't we.
>
> Thanks, I'll give that a go.
>
> Regards, Ernst
>
> ------------------------------
> *From:* Tarun Pahuja [mailto:pahujat@gmail.com]
> *Sent:* 11 November 2007 18:53
>
> *To:* Ernst Pelser
> *Cc:* ccielab@groupstudy.com
> *Subject:* Re: Internetwork experts R&S Adv. Technology v4 - Router on a
> stick and Native VLAN problem
>
> On a standard Ethernet interfaces the native VLAN must be 1, it is a
> limitation of Ethernet(10Meg) interface, do you have a router with a fast
> Ethernet interface? try replicating the configuration of R4 on a router than
> supports Fast Ethernet interfaces(100Meg).
>
> On Nov 11, 2007 1:51 PM, Ernst Pelser <e.pelser@infosecureltd.com> wrote:
>
> > Hi Tarun
> > Thanks for your response. Please see below:
> > *R1*
> > Building configuration...
> >
> > Current configuration : 710 bytes
> > !
> > version 12.3
> > service timestamps debug datetime msec
> > service timestamps log datetime msec
> > no service password-encryption
> > !
> > hostname R1
> > !
> > boot-start-marker
> > boot-end-marker
> > !
> > !
> > no aaa new-model
> > ip subnet-zero
> > ip cef
> > !
> > !
> > no ip domain lookup
> > !
> > !
> > !
> > !
> > !
> > interface Ethernet0/0
> > bandwidth 100000
> > ip address 16.0.0.1 255.0.0.0
> > full-duplex
> > !
> > interface Serial0/0
> > no ip address
> > shutdown
> > no fair-queue
> > !
> > interface Serial0/1
> > no ip address
> > shutdown
> > !
> > ip http server
> > ip classless
> > ip route 26.0.0.0 255.0.0.0 16.0.0.6
> > !
> > !
> > alias exec c conf t
> > alias exec inb sho ip int brief
> > alias exec r show run
> > alias exec rb show run | beg
> > !
> > line con 0
> > exec-timeout 0 0
> > logging synchronous
> > line aux 0
> > line vty 0 4
> > login
> > !
> > !
> > !
> > end
> >
> > *SW1*
> > version 12.1
> > no service pad
> > service timestamps debug uptime
> > service timestamps log uptime
> > no service password-encryption
> > !
> > hostname SW1
> > !
> > !
> > ip subnet-zero
> > !
> > no ip domain-lookup
> > !
> > spanning-tree mode pvst
> > spanning-tree extend system-id
> > !
> > !
> > interface FastEthernet0/1
> > switchport access vlan 16
> > switchport mode access
> > no ip address
> > duplex full
> > speed 10
> > !
> > interface FastEthernet0/2
> > switchport access vlan 26
> > switchport mode access
> > no ip address
> > !
> > interface FastEthernet0/3
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/4
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/5
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/6
> > switchport trunk encapsulation dot1q
> > switchport trunk native vlan 16
> > switchport mode trunk
> > no ip address
> > shutdown
> > duplex full
> > speed 10
> > !
> > interface FastEthernet0/7
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/8
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/9
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/10
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/11
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/12
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/13
> > switchport trunk encapsulation dot1q
> > switchport trunk native vlan 16
> > switchport mode trunk
> > no ip address
> > shutdown
> > !
> > interface FastEthernet0/14
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/15
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/16
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/17
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/18
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/19
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/20
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/21
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/22
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/23
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface FastEthernet0/24
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface GigabitEthernet0/1
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface GigabitEthernet0/2
> > switchport mode dynamic desirable
> > no ip address
> > !
> > interface Vlan1
> > no ip address
> > shutdown
> > !
> > interface Vlan16
> > ip address 16.0.0.2 255.0.0.0
> > !
> > ip classless
> > ip http server
> > !
> > !
> > alias exec c conf t
> > alias exec inb show ip int brief
> > alias exec r show run
> > alias exec rb show run | begin
> > !
> > line con 0
> > exec-timeout 0 0
> > logging synchronous
> > line vty 0 4
> > login
> > line vty 5 15
> > login
> > !
> > end
> >
> > *R4 (Using R4 only coz my R6 doesn't support trunking on the e0/0)*
> > version 12.3
> > service timestamps debug datetime msec
> > service timestamps log datetime msec
> > no service password-encryption
> > !
> > hostname R4
> > !
> > boot-start-marker
> > boot-end-marker
> > !
> > !
> > no aaa new-model
> > ip subnet-zero
> > !
> > !
> > no ip domain lookup
> > !
> > ip cef
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > interface Ethernet0/0
> > no ip address
> > full-duplex
> > !
> > interface Ethernet0/0.16
> > encapsulation dot1Q 16 native
> > ip address 16.0.0.6 255.0.0.0
> > no ip route-cache same-interface
> > no snmp trap link-status
> > !
> > interface Ethernet0/0.26
> > encapsulation dot1Q 26
> > ip address 26.0.0.6 255.0.0.0
> > no snmp trap link-status
> > !
> > interface Serial0/0
> > no ip address
> > shutdown
> > !
> > interface Ethernet0/1
> > no ip address
> > shutdown
> > half-duplex
> > !
> > interface Serial0/1
> > no ip address
> > shutdown
> > !
> > ip http server
> > ip classless
> > !
> > !
> > !
> > !
> > !
> > !
> > !
> > alias exec c conf t
> > alias exec inb show ip int brief
> > alias exec rb show run | begin
> > alias exec r sh run
> > !
> > line con 0
> > exec-timeout 0 0
> > logging synchronous
> > line aux 0
> > line vty 0 4
> > login
> > !
> > !
> > end
> >
> >
> > Regards, EP
> >
> > ------------------------------
> > *From:* Tarun Pahuja [mailto:pahujat@gmail.com]
> > *Sent:* 11 November 2007 18:38
> > *To:* Ernst Pelser
> > *Cc:* ccielab@groupstudy.com
> > *Subject:* Re: Internetwork experts R&S Adv. Technology v4 - Router on a
> > stick and Native VLAN problem
> >
> > Can you paste the config of the router and the switch please.
> > Tarun
> >
> > On Nov 11, 2007 1:30 PM, Ernst Pelser <ernst.pelser@infosecureltd.com>
> > wrote:
> >
> > > Hi All
> > > I'm doing the Internetnetwork experts R&S Adv. Technology v4 - Router
> > > on a
> > > stick and Native VLAN lab (page 12). I know configuration is correct
> > > but I
> > > can't seem to ping 16.0.0.6 from R1 (16.0.0.1).
> > >
> > > When I do a debug ip packet on R1 I get the following:
> > >
> > > *Mar 1 00:11: 31.353: IP: s=16.0.0.1 (local), d=16.0.0.6(Ethernet0/0), len
> > > 100, encapsulation failed.
> > >
> > > Doing a debug arp on R4 I get:
> > > *Mar 1 00:11:31.927: IP ARP req filtered src 16.0.0.1 0004.c05f.9e00,
> > > dst
> > > 16.0.0.6 0000.0000.0000 wrong cable, interface Ethernet0/0.
> > >
> > > I'm running the following devices:
> > > R1 = 2611
> > > R4 = 3620
> > >
> > > Any suggestions in what can be causing the problem?
> > >
> > > Thanks. EP
> > >
> > > _______________________________________________________________________
> > >
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
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