[c-nsp] VLAN Trunking Question

[Joseph Mays]

> * Have you defined the vlans?

Yes, they are defined in both the vlan database and the config on all the switches.

> * Why have a dirty net and have all vlans tagged on all ports, and not only on the ports you want them on?

At the moment I’m just trying to make it work. If I don’t specifically allow certain vlans on the trunk then (my understanding is) all the vlans should be allowed and passed by the trunk by default. I thought that should work. If and when it does, I intend to lock it down so only vlan 808 is allowed on the trunk. But there is not much point in applying filters to a trunk that is not working even when it’s wide open.

From: Peter Persson 
Sent: Tuesday, September 10, 2013 6:21 PM
To: Joseph Mays 
Subject: Re: [c-nsp] VLAN Trunking Question

Hey,

This would be right.
But i got a few questions.
* Have you defined the vlans?
* Why have a dirty net and have all vlans tagged on all ports, and not only on the ports you want them on?

/Peter

2013/9/10 Joseph Mays <mays at win.net>

  Okay, so I am trying to set up a single VLAN to go through a series of catalyst switches. What I need, effectively, is one long ethernet connection between two routers. I thought this should work but since it is not, clearly, I've fundamentally misunderstood something.


  Cisco 7206A(vlan 808 subinterface)>>--<<(vlan trunk Fe0/1)CatalystA(vlan trunk FE0/10)>>-...
  ...-<<(vlan trunk FE0/4)CatalystB(vlan trunk FE0/1)>>--<<(vlan trunk FE0/17)CatalystC(vlan trunk FE0/1)>>-...
  ...-<<(vlan 808 subinterface)Cisco 7206B


  The configs on each port, for the curious.

  Cisco 7206 A

  interface FastEthernet1/0.808
  description HN-808 interconnect to armplc via sw1.armplc
  encapsulation dot1Q 808
  ip address 216.24.2.202 255.255.255.252

  Catalyst A

  interface FastEthernet0/1
  description to gw1.armplc
  duplex full
  speed 100
  switchport trunk encapsulation dot1q
  switchport mode trunk
  no cdp enable

  interface FastEthernet0/10
  description Hatteras 1 - HN408-U
  switchport trunk encapsulation dot1q
  switchport mode trunk
  no cdp enable

  Catalyst B

  interface FastEthernet0/4
  description HN-808 interconnect to Armory Place
  switchport trunk encapsulation dot1q
  switchport mode trunk

  interface FastEthernet0/1
  description 802.1q trunk to core-sw1.noc (Heyburn 911) FE0/17
  load-interval 30
  duplex full
  speed 100
  switchport trunk encapsulation dot1q
  switchport mode trunk

  Catalyst C

  interface FastEthernet0/17
  description 802.1q trunk to core-sw3.noc.win.net (in Heyburn 513) FastEthernet0/0
  load-interval 30
  duplex full
  speed 100
  switchport trunk encapsulation dot1q
  switchport mode trunk
  no cdp enable

  interface FastEthernet0/1
  description 802.1q trunk to core-gw1.noc.win.net port FastEthernet0/0
  load-interval 30
  duplex full
  speed 100
  switchport trunk encapsulation dot1q
  switchport mode trunk
  no cdp enable

  Cisco 7206 B

  interface FastEthernet0/0.808
  description HN-808 interconnect to armplc via core-sw3
  encapsulation dot1Q 808
  ip address 216.24.2.201 255.255.255.252
  no cdp enable
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