From: Tarun Pahuja (pahujat@gmail.com)
Date: Thu Oct 25 2007 - 05:35:55 ART
Kuldip,
Your configuration would have worked if you were using
Fastethernet interface on the router. Since you are using standard
Ethernet interface you were running into the issue. Your question was
answered by brian correctly, I am just clarifying the basis of my
answer.
When I was preparing for my CCIE a couple of years ago, even the
encapsulation option was not available under standard Ethernet
sub-interface. Seems like Cisco added that command with limited
functionality quite a while ago.
I feel old now ;-(
Thanks,
Tarun
On 10/25/07, Darby Weaver <darbyweaver@yahoo.com> wrote:
> Thanks Brian,
>
> I never realized this before. Since I upgraded my
> primary rack and used to have some issues with native
> VLANs - I may have had some trouble with this in the
> past - come to think of it.
>
> Good one.
>
>
> --- Brian Dennis <bdennis@internetworkexpert.com>
> wrote:
>
> > On standard 10meg Ethernet interfaces the native
> > VLAN must be 1.
> >
> > --
> >
> > Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
> > bdennis@internetworkexpert.com
> >
> > Internetwork Expert, Inc.
> > http://www.InternetworkExpert.com
> > Toll Free: 877-224-8987
> > Direct: 775-852-3995 (Outside the US and Canada)
> >
> > kuldip singh wrote:
> > > Hi,
> > >
> > > It seems like I can't get the native VLAN to
> > work. As shown below
> > > I have two sub-interfaces configured on R4, vlan
> > 10 and vlan 555. if the
> > > sub-interfaces are configured as trunk ports and
> > the switchport is
> > > configured as trunk port I can ping the
> > 10.10.10.201 and 131.10.160.5 (R5
> > > connected to switch 3). If I change the
> > sub-interface on R4 (e0/1.10 ) to
> > > mark vlan 10 as native and change the config on
> > switch 4 to mark the vlan 10
> > > as native. I can't ping 10.10.10.201 address, but
> > I can still ping vlan 555
> > > ok.
> > > Can somebody spot the issue. (This is from one of
> > the NMC documents).
> > >
> > >
> > > Thanks
> > >
> > >
> > > R4: (R4 connected to Switch 4)
> > >
> > >
> > > interface Ethernet0/1
> > > no ip address
> > > half-duplex
> > > !
> > > interface Ethernet0/1.10
> > > encapsulation dot1Q 10
> > > ip address 10.10.10.1 255.255.255.0
> > > no snmp trap link-status
> > > !
> > > interface Ethernet0/1.555
> > > encapsulation dot1Q 555
> > > ip address 131.10.160.1 255.255.255.0
> > > no snmp trap link-status
> > >
> > >
> > >
> > > SW4:
> > >
> > > interface FastEthernet0/4
> > > switchport trunk encapsulation dot1q
> > > switchport mode trunk
> > >
> > > interface Vlan10
> > > ip address 10.10.10.201 255.255.255.0
> > >
> > >
> > > SW3;
> > >
> > > interface FastEthernet0/5
> > > switchport access vlan 555
> > > switchport mode access
> > >
> > >
> > >
> > > Ping from R4;
> > >
> > > Rack9SW4#ping 10.10.10.201
> > >
> > > Sending 1, 100-byte ICMP Echos to 10.10.10.201,
> > timeout is 2 seconds:
> > > !
> > > Success rate is 100 percent (1/1), round-trip
> > min/avg/max = 4/4/4 ms
> > > Rack9SW4#
> > >
> > > Sending 1, 100-byte ICMP Echos to 131.10.160.5,
> > timeout is 2 seconds:
> > > !
> > > Success rate is 100 percent (1/1), round-trip
> > min/avg/max = 1/1/1 ms
> > > Rack9SW4#
> > >
> > >
> > >
> > >
> > > Now change the config on R4 and SW4 to make VLAN
> > 10 native.
> > >
> > > R4:
> > >
> > > interface Ethernet0/1.10
> > > encapsulation dot1Q 10 native
> > > ip address 10.10.10.1 255.255.255.0
> > > no snmp trap link-status
> > > end
> > >
> > >
> > >
> > > SW4:
> > >
> > > interface FastEthernet0/4
> > > switchport trunk encapsulation dot1q
> > > switchport trunk native vlan 10
> > > switchport mode trunk
> > > end
> > >
> > >
> > > Ping from R4:
> > >
> > > Rack9R4#ping 10.10.10.201
> > >
> > > Type escape sequence to abort.
> > > Sending 5, 100-byte ICMP Echos to 10.10.10.201,
> > timeout is 2 seconds:
> > > .....
> > > Success rate is 0 percent (0/5)
> > > Rack9R4#
> > >
> > > Rack9R4#ping 131.10.160.5
> > >
> > > Type escape sequence to abort.
> > > Sending 5, 100-byte ICMP Echos to 131.10.160.5,
> > timeout is 2 seconds:
> > > !!!!!
> > > Success rate is 100 percent (5/5), round-trip
> > min/avg/max = 1/3/4 ms
> > > Rack9R4#
> > >
> > >
> > > debug on the route R4 indicates encapsulation
> > failure when vlan 10 is made
> > > native.
> > >
> > > Oct 24 08:34:38.682: IP: s=10.10.10.1 (local),
> > d=10.10.10.201(Ethernet0/1.10),
> > > len 100, sending
> > > Oct 24 08:34:38.686: IP: s=10.10.10.1 (local),
> > d=10.10.10.201(Ethernet0/1.10),
> > > len 100, encapsulation failed.
> > > Oct 24 08:34:40.682: IP: tableid=0, s=10.10.10.1
> > (local), d=10.10.10.201(Ethern
> > > et0/1.10), routed via RIB
> > > Oct 24 08:34:40.682: IP: s=10.10.10.1 (local),
> > d=10.10.10.201(Ethernet0/1.10),
> > > len 100, sending
> > >
> > >
> >
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