+ Post New Thread
Results 1 to 3 of 3
Wireless Networks Thread, Cisco, Procurve and my wonderful county :) in Technical; So I have a Procurve (HP) network with 3 vlans, Curric, Admin and Videoconferencing. This covers the school nicely and ...
  1. #1
    AlexB's Avatar
    Join Date
    Jul 2006
    Location
    Warwickshire
    Posts
    373
    Thank Post
    37
    Thanked 39 Times in 35 Posts
    Rep Power
    23

    Cisco, Procurve and my wonderful county :)

    So I have a Procurve (HP) network with 3 vlans, Curric, Admin and Videoconferencing. This covers the school nicely and I don't think needs much explaining.

    Prodived by County to connect to the internet I have a cisco router and switch with 24 ports. These have 4 vlans, Curric, Admin, We-learn and videoconferencing

    On the county Cisco switch Port 1 is connected to the router, ports 2-10 are Curric, 11-16 are VC, 17-22 are Admin and 23 & 24 are We-learn.

    From the county cisco switch I have a single connection from a port on the curric, admin and VC vlans into one of the Procurve switches. The ports on the procurve are set as untagged and to the correct vlan for each.

    The various Procurves are connected by tagged connections (trunks for you cisco bods) and all work fine, they can connect to the county cisco on whatever vlan they are set to and then to the outside world.

    So everything works fine. As you may have guessed I have no control over the county ciscos, hence I haven't simply trunked from the cisco to the procurves.

    So I'm happy, everything works and its a lovely vlan setup so I can change things around real easy.

    Now here is where things start to go wrong...

    I've been given 2 48+2Gbit port Cisco Catalyst 2948G switches. They are pretty old, but they do work and it seems a terrible waste not to use em.

    So I set one of them up to take a trunked/tagged connection from a Procurve. Set the vlans up to match the procurves, set dot1q-all-tagged so that even the native defafult vlan 1 is tagged and set the vtp to transparent.

    Plug in to the procurve, takes it sweet time but before too long I can connect machines to it and they dhcp and can ping about the place on whatever vlan I set their port to. For the Admin and VC vlans, 2 and 4 are the IDs, I can reach the county cisco and get to the outside world.

    However , for the Curric vlan (ID 1) I cannot reach the county cisco and worse still the port on the county cisco connected to my procurve shuts down and no one on the curric vlan can talk to the county cisco or get to the outside world, even those that previously could before I connected my cisco switch.

    Now the first time I connected I got an error message coming up on the county cisco (I can at least connect to the console and see the error messages ) complained about SPANTREE-7-RECV_1Q_NON_TRUNK: Received 802.1q BPDU on a non trunk FastEthernet 0/18 VLAN 3. So this was picking up a spantree message on the admin port connected to my procurve.
    It gave the same spantree message some other ports and blocked each port.

    So I turned off spantree on my cisco and the county cisco stopped complaining and unblocked the ports... even told me it was unblocking them

    So here I am, the admin and VC vlans are fine, but the curric one doesn't work. On the very slim chance anyone has come across something like this before, could you tell me where I'm going wrong?

    Thanks

  2. #2
    DMcCoy's Avatar
    Join Date
    Oct 2005
    Location
    Isle of Wight
    Posts
    3,464
    Thank Post
    10
    Thanked 496 Times in 436 Posts
    Rep Power
    113

    Re: Cisco, Procurve and my wonderful county :)

    Cisco default vlans (1) are not quite the same as all the rest as far as I understand it and there are some restrictions on their use. Its seems that vlan 1 on ciscos cannot carry tagged data. You need to use a different vlan ID for the curriculum vlan if you wish to use it with the cisco switches.

  3. #3
    AlexB's Avatar
    Join Date
    Jul 2006
    Location
    Warwickshire
    Posts
    373
    Thank Post
    37
    Thanked 39 Times in 35 Posts
    Rep Power
    23

    Re: Cisco, Procurve and my wonderful county :)

    I've tried both tagging and untagging, but the same effect. I too had read that cisco default vlan cannot carry tagged data, but it offers me the command:-
    set dot1q-all-tagged enable
    Which returns:-
    Packets on Native vlan will be tagged.
    Which seems to suggest otherwise, anyway, I tried both already

SHARE:
+ Post New Thread

Similar Threads

  1. Cisco PIX, HP Procurve or just ISA?
    By mrforgetful in forum Wireless Networks
    Replies: 2
    Last Post: 5th September 2007, 10:21 AM
  2. Cumbria County Council job evaluation
    By StewartKnight in forum General Chat
    Replies: 10
    Last Post: 22nd March 2007, 02:51 PM
  3. Caerphilly County Borough ICT Technician
    By Pegasus in forum Educational IT Jobs
    Replies: 0
    Last Post: 13th December 2005, 09:50 AM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •