Switching

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Ask questions and share experiences about EX and QFX portfolios and all switching solutions across your data center, campus, and branch locations.

  • 1.  Cisco IP Phones on Juniper EX4200's

    Posted 03-19-2013 12:35

    Has anyone ever configured/supported Cisco IP phones on Juniper EX-series switches? Can it be done? What are the drawbacks/concerns? I am no Cisco VoIP guru, but I know that they are supposed to use CDP to communicate between phone and switch. Obviously since this is a Cisco proprietary protocol, can it still be supported w/o CDP?

     

    We are in the equipment selection phase of a project coming down the line and the customer wants to use Cisco VoIP (as well as Cisco WLC and WAP's). There will potentially be a mix however of that along with Avaya phones and MS Lync soft phone.

     

    I personally am designing for an ALL Juniper EX setup (6x 4200's in a VC x 3 Floors, each with 20G LAGs) aggregating back to a 2-member 4550 VC. The 4550 may/may not have routing enabled, I have not decided yet if I want to use my existing 4200 VC cores for Layer 3 with VRRP between the chassis' (probably overkill).

     

    I will be spec'ing out Cisco gear as well (since I have to). Any help on the VoIP support on Juniper would be much appreciated !!!!

     

    Thanks In Advance.

     



  • 2.  RE: Cisco IP Phones on Juniper EX4200's
    Best Answer

     
    Posted 03-19-2013 21:48

     

    Hi Marc,

     

    As Juniper EX-Series does not support CDP, so it can be acheived through lldp-med.

    These are the Cisco ip phones which fully support the LLDP-MED protocol.

     

    The following Cisco phones models with firmware version 8.3(3) or later support the LLDP-MED protocol:

    •7906G
    •7911G
    •7931G
    •7941G/7941G-GE
    •7942G
    •7945G
    •7961G/7961G-GE
    •7962G
    •7965G
    •7970G/ 7971G-GE
    •7975G "

     

    See this link

     

    http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7975g/firmware/8_3_3/english/release/notes/75833.html#wp134580

     

     

    Also these might be usefull data. I suggest you go through these doc before deployment.

     

    http://www.juniper.net/us/en/local/pdf/app-notes/3500131-en.pdf

     

    http://www.cisco.com/en/US/technologies/tk652/tk701/technologies_white_paper0900aecd804cd46d.html

     



  • 3.  RE: Cisco IP Phones on Juniper EX4200's

    Posted 03-20-2013 11:26

    turn on both LLD and LLDP-MED and all should work.



  • 4.  RE: Cisco IP Phones on Juniper EX4200's

    Posted 03-20-2013 11:56

    @dipanc -- Thank you for that information. I read through all the material and from what it sounds like, I can support Cisco IP Phones on EX switches. Whether or Not the Cisco phones support LLDP-MED, they should still work with some added caveats.

     

    Unfortunately, 2 of the 3 phones that were selected do not support LLDP-MED. That means that I will have to hard set the Voice and Data vlans into every phone manually, as well as the 802.1P parameters. Having the LLDP-MED support would make our life a lot easier from a management perspective. Having to hardcode those parameters removes the portability of the user taking their phone from one floor to another (unless of course those VLAN's live on that floor).



  • 5.  RE: Cisco IP Phones on Juniper EX4200's

     
    Posted 03-21-2013 00:01

    That should work....All the best with the deployment...



  • 6.  RE: Cisco IP Phones on Juniper EX4200's

    Posted 04-20-2018 08:16

    See my post

    https://forums.juniper.net/t5/Ethernet-Switching/Cisco-CDP-phones-working-on-EX-ELS-switches/m-p/321989#M18067

    You have to do a little work yourself .. but not a lot ..