Re: Router on a stick question

This is what I am talking about:

This part shows you what is allowed over the trunk:

Port Vlans allowed and active in management domain
Et2/0 1,67,79,100
Et2/1 1,67,79,100
Et2/2 1,67,79,100
Et3/0 1,67,79,100
Et3/1 1,67,79,100
Et3/2 1,67,79,100
Et4/0 1,67,79,100
Et4/1 1,67,79,100
Et4/2 1,67,79,100

This part shows you what is actually being sent over the trunk. For this
part the entry for Et2/0, 4/0, 4/1, and 4/2 are what you would want to see.
Your VLANs are being sent. The entries for E2/1 - 3/2 aren't sending any
VLANs over the trunk. Usually this is going to only happen if you have VLAN
pruning turned on or if the interface is in Spanning-tree blocking state
for those VLANS.

Port Vlans in spanning tree forwarding state and not pruned
Et2/0 1,67,79,100
Et2/1 none
Et2/2 none
Et3/0 none
Et3/1 none
Et3/2 none
Et4/0 1,67,79,100
Et4/1 1,67,79,100
Et4/2 1,67,79,100

Like I said IOU does some strange things, especially around layer 2 stuff.
One thing that threw me for a loop in the troubleshooting lab is that the
result of "show run | sec bgp" would only show me part of the BGP
configuration. Leaving out part of the config so I had to start using "show
run | beg router bgp" instead to see the bgp config.

-Marc

On Fri, Mar 15, 2013 at 4:51 PM, Maneesh Chawla <coolmaneesh_at_gmail.com>wrote:

> Thank Marc !!
> You are right that I am running IOU.
>
> I am still trying to understand which o/p.
>
> I thought the o/p was ok due to spanning-tree running on the links.
>
>
>
> On Fri, Mar 15, 2013 at 2:48 PM, marc abel <marcabel_at_gmail.com> wrote:
>
>> That seems like an artifact of running IOU. I noticed in your first show
>> int trunk that it showed there were no vlans it was forwarding for on the
>> trunks even though they were allowed. That is why I was asking about
>> spanning-tree, I think this is just likely a software glitch for you.
>>
>>
>> On Fri, Mar 15, 2013 at 4:36 PM, Maneesh Chawla <coolmaneesh_at_gmail.com>wrote:
>>
>>> Strange thing happened.
>>>
>>> I had below on sw1 :
>>>
>>> Rack1SW1#show interfa trunk
>>>
>>> Port Mode Encapsulation Status Native vlan
>>> Et2/0 desirable n-802.1q trunking 1
>>> Et2/1 desirable n-802.1q trunking 1
>>> Et2/2 desirable n-802.1q trunking 1
>>> Et3/0 desirable n-802.1q trunking 1
>>>
>>> <snipped from show run>
>>>
>>> !
>>> interface Ethernet2/0
>>> duplex auto
>>> !
>>> interface Ethernet2/1
>>> duplex auto
>>> !
>>> interface Ethernet2/2
>>> duplex auto
>>> !
>>>
>>>
>>>
>>> Now, made the below change and everything worked.
>>>
>>> Enter configuration commands, one per line. End with CNTL/Z.
>>> Rack1SW1(config)#interface range e2/0-2
>>> Rack1SW1(config-if-range)#switchport trunk encap dot1
>>> Rack1SW1(config-if-range)#switchport mode trunk
>>> Rack1SW1(config-if-range)#
>>>
>>>
>>>
>>> Can someone help me understand this ?
>>>
>>> Thanks
>>> Maneesh
>>>
>>> On Fri, Mar 15, 2013 at 2:24 PM, marc abel <marcabel_at_gmail.com> wrote:
>>>
>>>> Does VLAN 67 exist on Sw2?
>>>>
>>>> Please also provide show int trunk from SW2, as well as a show span
>>>> vlan 67 on Sw1/
>>>>
>>>>
>>>>
>>>> On Fri, Mar 15, 2013 at 3:58 PM, Kapil Atrish <kapilatrish_at_hotmail.com>wrote:
>>>>
>>>>> Can you add int vlan 67 on Switch 2 as well and see which side is
>>>>> pingable
>>>>> from there? Perhaps, create the following int on SW2 and try to ping
>>>>> Router
>>>>> and SW1 both to get an idea which side is failing. SW2:
>>>>> interface Vlan67
>>>>> ip address 155.15.67.10 255.255.255.0
>>>>> Thanks,Kapil Also, > Date: Fri, 15 Mar 2013 10:54:32 -0700
>>>>> > Subject: Re: Router on a stick question
>>>>> > From: coolmaneesh_at_gmail.com
>>>>> > To: jb.poplawski_at_gmail.com
>>>>> > CC: ccielab_at_groupstudy.com
>>>>> >
>>>>> > Auto-negotiated
>>>>> >
>>>>> > Rack1SW1#show interface trunk
>>>>> >
>>>>> > Port Mode Encapsulation Status Native
>>>>> vlan
>>>>> > Et2/0 desirable n-802.1q trunking 1
>>>>> > Et2/1 desirable n-802.1q trunking 1
>>>>> > Et2/2 desirable n-802.1q trunking 1
>>>>> > Et3/0 desirable n-802.1q trunking 1
>>>>> > Et3/1 desirable n-802.1q trunking 1
>>>>> > Et3/2 desirable n-802.1q trunking 1
>>>>> > Et4/0 desirable n-isl trunking 1
>>>>> > Et4/1 desirable n-isl trunking 1
>>>>> > Et4/2 desirable n-isl trunking 1
>>>>> >
>>>>> > Port Vlans allowed on trunk
>>>>> > Et2/0 1-4094
>>>>> > Et2/1 1-4094
>>>>> > Et2/2 1-4094
>>>>> > Et3/0 1-4094
>>>>> > Et3/1 1-4094
>>>>> > Et3/2 1-4094
>>>>> > Et4/0 1-4094
>>>>> > Et4/1 1-4094
>>>>> > Et4/2 1-4094
>>>>> >
>>>>> > Port Vlans allowed and active in management domain
>>>>> > Et2/0 1,67,79,100
>>>>> > Et2/1 1,67,79,100
>>>>> > Et2/2 1,67,79,100
>>>>> > Et3/0 1,67,79,100
>>>>> > Et3/1 1,67,79,100
>>>>> > Et3/2 1,67,79,100
>>>>> > Et4/0 1,67,79,100
>>>>> > Et4/1 1,67,79,100
>>>>> > Et4/2 1,67,79,100
>>>>> >
>>>>> > Port Vlans in spanning tree forwarding state and not
>>>>> pruned
>>>>> > Et2/0 1,67,79,100
>>>>> > Et2/1 none
>>>>> > Et2/2 none
>>>>> > Et3/0 none
>>>>> > Et3/1 none
>>>>> > Et3/2 none
>>>>> > Et4/0 1,67,79,100
>>>>> > Et4/1 1,67,79,100
>>>>> > Et4/2 1,67,79,100
>>>>> >
>>>>> >
>>>>> > On Fri, Mar 15, 2013 at 10:51 AM, JB Poplawski
>>>>> <jb.poplawski_at_gmail.com>wrote:
>>>>> >
>>>>> > > Interface up on the switch? Is Switch A supposed to trunk
>>>>> somewhere, I
>>>>> > > don't see it.
>>>>> > >
>>>>> > >
>>>>> > > On Fri, Mar 15, 2013 at 12:46 PM, Maneesh Chawla
>>>>> <coolmaneesh_at_gmail.com>wrote:
>>>>> > >
>>>>> > >> Topo
>>>>> > >> -------
>>>>> > >>
>>>>> > >> .7 .6
>>>>> > >> SW1------------------------------R6
>>>>> > >>
>>>>> > >> (155.15.67.0/24 vlan 67)
>>>>> > >>
>>>>> > >>
>>>>> > >> Physical topo
>>>>> > >> --------------------
>>>>> > >>
>>>>> > >>
>>>>> > >>
>>>>>
>>>>> SW1-(e2/0-2)-------------------(e2/0-2)-SW2-(e1/2)-------------------(e0/0)-R
>>>>> 6
>>>>> > >>
>>>>> > >>
>>>>> > >> I have attached below the configs. The example is taken from INE
>>>>> videos
>>>>> > >> module 1 lesson 1.
>>>>> > >>
>>>>> > >> not able to ping from R6 to SW1.
>>>>> > >> Not sure what am I missing here. Can the gurus help out ?
>>>>> > >>
>>>>> > >> Attached the configs.
>>>>> > >> R6
>>>>> > >> -------
>>>>> > >>
>>>>> > >> Rack1R6#show run
>>>>> > >> Building configuration...
>>>>> > >>
>>>>> > >> Current configuration : 1414 bytes
>>>>> > >> !
>>>>> > >> ! Last configuration change at 18:19:48 CET Fri Mar 15 2013
>>>>> > >> !
>>>>> > >> version 12.4
>>>>> > >> service timestamps debug datetime msec
>>>>> > >> service timestamps log datetime msec
>>>>> > >> no service password-encryption
>>>>> > >> !
>>>>> > >> hostname Rack1R6
>>>>> > >> !
>>>>> > >> boot-start-marker
>>>>> > >> boot-end-marker
>>>>> > >> !
>>>>> > >> !
>>>>> > >> no aaa new-model
>>>>> > >> clock timezone CET 1
>>>>> > >> mmi polling-interval 60
>>>>> > >> no mmi auto-configure
>>>>> > >> no mmi pvc
>>>>> > >> mmi snmp-timeout 180
>>>>> > >> ip source-route
>>>>> > >> ip auth-proxy max-login-attempts 5
>>>>> > >> ip admission max-login-attempts 5
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> ip cef
>>>>> > >> no ip domain lookup
>>>>> > >> no ipv6 traffic interface-statistics
>>>>> > >> no ipv6 cef
>>>>> > >> !
>>>>> > >> multilink bundle-name authenticated
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> redundancy
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> interface Ethernet0/0
>>>>> > >> no ip address
>>>>> > >> !
>>>>> > >> interface Ethernet0/0.67
>>>>> > >> encapsulation dot1Q 67
>>>>> > >> ip address 155.15.67.6 255.255.255.0
>>>>> > >> !
>>>>> > >> interface Ethernet0/1
>>>>> > >> no ip address
>>>>> > >> !
>>>>> > >> interface Ethernet0/2
>>>>> > >> no ip address
>>>>> > >> !
>>>>> > >> interface Ethernet0/3
>>>>> > >> no ip address
>>>>> > >> !
>>>>> > >> interface Serial1/0
>>>>> > >> no ip address
>>>>> > >> serial restart-delay 0
>>>>> > >> !
>>>>> > >> interface Serial1/1
>>>>> > >> no ip address
>>>>> > >> serial restart-delay 0
>>>>> > >> !
>>>>> > >> interface Serial1/2
>>>>> > >> no ip address
>>>>> > >> serial restart-delay 0
>>>>> > >> !
>>>>> > >> interface Serial1/3
>>>>> > >> no ip address
>>>>> > >> serial restart-delay 0
>>>>> > >> !
>>>>> > >> ip forward-protocol nd
>>>>> > >> !
>>>>> > >> !
>>>>> > >> no ip http server
>>>>> > >> no ip http secure-server
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> control-plane
>>>>> > >> !
>>>>> > >> !
>>>>> > >> line con 0
>>>>> > >> exec-timeout 0 0
>>>>> > >> privilege level 15
>>>>> > >> logging synchronous
>>>>> > >> line aux 0
>>>>> > >> exec-timeout 0 0
>>>>> > >> privilege level 15
>>>>> > >> line vty 0 4
>>>>> > >> login
>>>>> > >> transport input all
>>>>> > >> !
>>>>> > >> exception data-corruption buffer truncate
>>>>> > >> end
>>>>> > >>
>>>>> > >>
>>>>> > >>
>>>>> > >>
>>>>> > >> sw1
>>>>> > >> -------
>>>>> > >>
>>>>> > >>
>>>>> > >> Rack1SW1#show run
>>>>> > >> Building configuration...
>>>>> > >>
>>>>> > >> Current configuration : 1597 bytes
>>>>> > >> !
>>>>> > >> ! Last configuration change at 18:10:16 CET Fri Mar 15 2013
>>>>> > >> !
>>>>> > >> version 15.0
>>>>> > >> service timestamps debug datetime msec
>>>>> > >> service timestamps log datetime msec
>>>>> > >> no service password-encryption
>>>>> > >> !
>>>>> > >> hostname Rack1SW1
>>>>> > >> !
>>>>> > >> boot-start-marker
>>>>> > >> boot-end-marker
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> no aaa new-model
>>>>> > >> clock timezone CET 1
>>>>> > >> !
>>>>> > >> ip cef
>>>>> > >> no ip domain-lookup
>>>>> > >> !
>>>>> > >> no ipv6 cef
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> spanning-tree mode pvst
>>>>> > >> spanning-tree extend system-id
>>>>> > >> !
>>>>> > >> vlan internal allocation policy ascending
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> interface Ethernet0/0
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet0/1
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet0/2
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet0/3
>>>>> > >> no switchport
>>>>> > >> ip address 155.15.37.7 255.255.255.0
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet1/0
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet1/1
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet1/2
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet1/3
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet2/0
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet2/1
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet2/2
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet2/3
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet3/0
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet3/1
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet3/2
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet3/3
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet4/0
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet4/1
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet4/2
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet4/3
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Vlan1
>>>>> > >> no ip address
>>>>> > >> shutdown
>>>>> > >> !
>>>>> > >> interface Vlan67
>>>>> > >> ip address 155.15.67.7 255.255.255.0
>>>>> > >> !
>>>>> > >> interface Vlan79
>>>>> > >> ip address 155.15.79.7 255.255.255.0
>>>>> > >> !
>>>>> > >> !
>>>>> > >> ip forward-protocol nd
>>>>> > >> no ip http server
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> control-plane
>>>>> > >> !
>>>>> > >> !
>>>>> > >> line con 0
>>>>> > >> exec-timeout 0 0
>>>>> > >> privilege level 15
>>>>> > >> logging synchronous
>>>>> > >> line aux 0
>>>>> > >> line vty 0 4
>>>>> > >> login
>>>>> > >> transport input all
>>>>> > >> !
>>>>> > >> end
>>>>> > >>
>>>>> > >>
>>>>> > >>
>>>>> > >> sw2
>>>>> > >> -------
>>>>> > >>
>>>>> > >> Rack1SW2#show run
>>>>> > >> Building configuration...
>>>>> > >>
>>>>> > >> Current configuration : 1674 bytes
>>>>> > >> !
>>>>> > >> ! Last configuration change at 17:35:16 CET Fri Mar 15 2013
>>>>> > >> !
>>>>> > >> version 15.0
>>>>> > >> service timestamps debug datetime msec
>>>>> > >> service timestamps log datetime msec
>>>>> > >> no service password-encryption
>>>>> > >> !
>>>>> > >> hostname Rack1SW2
>>>>> > >> !
>>>>> > >> boot-start-marker
>>>>> > >> boot-end-marker
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> no aaa new-model
>>>>> > >> clock timezone CET 1
>>>>> > >> !
>>>>> > >> ip cef
>>>>> > >> no ip domain-lookup
>>>>> > >> !
>>>>> > >> no ipv6 cef
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> spanning-tree mode pvst
>>>>> > >> spanning-tree extend system-id
>>>>> > >> !
>>>>> > >> vlan internal allocation policy ascending
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> interface Ethernet0/0
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet0/1
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet0/2
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet0/3
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet1/0
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet1/1
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet1/2
>>>>> > >> switchport trunk encapsulation dot1q
>>>>> > >> switchport mode trunk
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet1/3
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet2/0
>>>>> > >> switchport trunk encapsulation dot1q
>>>>> > >> switchport mode trunk
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet2/1
>>>>> > >> switchport trunk encapsulation dot1q
>>>>> > >> switchport mode trunk
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet2/2
>>>>> > >> switchport trunk encapsulation dot1q
>>>>> > >> switchport mode trunk
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet2/3
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet3/0
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet3/1
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet3/2
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet3/3
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet4/0
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet4/1
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet4/2
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Ethernet4/3
>>>>> > >> duplex auto
>>>>> > >> !
>>>>> > >> interface Vlan1
>>>>> > >> no ip address
>>>>> > >> shutdown
>>>>> > >> !
>>>>> > >> !
>>>>> > >> ip forward-protocol nd
>>>>> > >> no ip http server
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> !
>>>>> > >> control-plane
>>>>> > >> !
>>>>> > >> !
>>>>> > >> line con 0
>>>>> > >> exec-timeout 0 0
>>>>> > >> privilege level 15
>>>>> > >> logging synchronous
>>>>> > >> line aux 0
>>>>> > >> line vty 0 4
>>>>> > >> login
>>>>> > >> transport input all
>>>>> > >> !
>>>>> > >> end
>>>>> > >>
>>>>> > >>
>>>>> > >> Blogs and organic groups at http://www.ccie.net
>>>>> > >>
>>>>> > >>
>>>>> _______________________________________________________________________
>>>>> > >> Subscription information may be found at:
>>>>> > >> http://www.groupstudy.com/list/CCIELab.html
>>>>> >
>>>>> >
>>>>> > Blogs and organic groups at http://www.ccie.net
>>>>> >
>>>>> >
>>>>> _______________________________________________________________________
>>>>> > Subscription information may be found at:
>>>>> > http://www.groupstudy.com/list/CCIELab.html
>>>>>
>>>>>
>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>
>>>>> _______________________________________________________________________
>>>>> Subscription information may be found at:
>>>>> http://www.groupstudy.com/list/CCIELab.html
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Marc Abel
>>>> CCIE #35470
>>>> (Routing and Switching)
>>>>
>>>
>>>
>>
>>
>> --
>> Marc Abel
>> CCIE #35470
>> (Routing and Switching)
>>
>
>

-- 
Marc Abel
CCIE #35470
(Routing and Switching)
Blogs and organic groups at http://www.ccie.net