[j-nsp] SRX650 cluster - ethernet switching issue

[Paulhamus, Jon]

??

Why not?  If you have more devices that need access to specific vlan zones on the SRX, and you're low on physical interfaces, why not use a switch.  This can be extremely handy when bringing trunks into a VMWare server(s).  I'm not sure what you're saying about especially in a cluster either - clustering of the firewalls is soley for redundancy in my situation.

If you think there are better options, I'm opened to recommendations.



From: Павел Лунин [plunin at senetsy.ru]
Sent: Friday, January 06, 2012 5:45 AM
To: Paulhamus, Jon
Cc: Ben Dale; juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] SRX650 cluster - ethernet switching issue


BTW, never could understand people running L2 on srx650 coupled with a normal switch. Especially in srx-cluster + ex-vc. What for?

03.01.2012 16:07 пользователь "Paulhamus, Jon" <jpaulhamus at iu17.org<mailto:jpaulhamus at iu17.org>> написал:
Thank you Ben.  I did configure MSTP and saw other issues with the config, but I don't believe that I tried VSTP.  I'll give that a go this coming weekend.  I appreciate your input!


------------------------





-----Original Message-----
From: Ben Dale [mailto:bdale at comlinx.com.au<mailto:bdale at comlinx.com.au>]
Sent: Monday, January 02, 2012 5:18 AM
To: Paulhamus, Jon
Cc: juniper-nsp at puck.nether.net<mailto:juniper-nsp at puck.nether.net>
Subject: Re: [j-nsp] SRX650 cluster - ethernet switching issue

Hi John,

>
> My issue is that I have 2 trunk links on each firewall passing completely different VLAN's but when I enable any form of spanning tree, I'm seeing one of those links blocked (3 out of the 4 links get blocked by STP).  I've tried rstp, stp and mstp - all with the same issue.

This is expected behaviour.  Neither RSTP nor STP are VLAN-aware, so they simply see a topology containing 3 bridges (SRX, EX, EX-VC) in a loop and block the port "furtherest" from the root bridge.

A simple fix would be VSTP (per-VLAN Spanning-Tree), but the SRX platform didn't support it last time I checked.

You can use MSTP can solve this issue by allowing multiple forwarding topologies, but it will require specific configuration all three devices - if you simply enable it with defaults, it will behave exactly the same way as RSTP.

Plenty of info on the specifics of MSTP can be found here:

http://www.juniper.net/techpubs/en_US/junos9.4/topics/example/spanning-trees-ex-series-mstp-configuring.html
http://kb.juniper.net/library/CUSTOMERSERVICE/technotes/8010065-001-EN.pdf

Good luck!

Ben

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