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Author Topic: ERS 5510 Layer 3 connection to ERS5520 Layer 2 Stack  (Read 2663 times)

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Offline ableseaman

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ERS 5510 Layer 3 connection to ERS5520 Layer 2 Stack
« on: May 29, 2013, 11:33:42 AM »
Afternoon

Looking for some advise on connecting a layer 2 ERS5520 stack (2 x 48 port switches) to a single layer3 ERS5510 switch (1 x 24 port switch), running advanced routing software. We currently have one fibre uplink connecting the 2 devices (core and stack) - simply set-up as a trunk port on both switches.

Now my server colleagues have identified single points of failure with this set-up i.e. single core switch, single uplink, etc - this was pointed out at the time of deployment. This set-up isn't part of our core LAN but is a standalone set-up to serve a seperate organisation we support.

Within our Core LAN we have a typical Core/Edge deployment - 2 x Avaya ERS8600 switches at the core with ERS5520 switches at the edge. We have IST set-up between cores and SMLT set-up to the 5520 edge switches. As such I am familiar with the associated set-up.

We don't have budget for a secondary layer 3 switch at this stage but have spare GBICs so can only really provide a second uplink between the single layer 3 5510 and the 2nd Edge ERS 5520 - we would have 2 uplinks connecting to ports 23 & 24 on the 5510 to port 1/48 and 2/48 on the edge stack. The thought here would be that the if a single edge switch failed or one of the uplinks we would still retain service.

Any advise on the best approach to this would be appreciated.


Offline TankII

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Re: ERS 5510 Layer 3 connection to ERS5520 Layer 2 Stack
« Reply #1 on: May 29, 2013, 12:50:22 PM »
Standard D-MLT design in my book.  Distributed MLT, BTW.
Do stuff like this all the time.
You need a /29 network mask as the L-3 connectivity is going to be tagged through the 5520's to the 8600's and each 8600 need an IP address on that VLAN.
So, new L-3 VLAN, tagged to SLT links on 5520's to the DMLT on the 5510.
L-3 IP on 5510 and 8600's /29 mask.

Enjoy!

Tank II

Offline ableseaman

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Re: ERS 5510 Layer 3 connection to ERS5520 Layer 2 Stack
« Reply #2 on: May 29, 2013, 02:58:30 PM »
Cheers for responding Tank

Ive probably overcomplicated this post as the 8600s arent relavent to the question. I was just making refference to them as we use them in our seperate campus lan.

The question is basically the best option for linking the 5510 'core' with the 5520 'edge' stack.

Can we use a DMLT in this scenario?

Offline TankII

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Re: ERS 5510 Layer 3 connection to ERS5520 Layer 2 Stack
« Reply #3 on: May 31, 2013, 11:35:29 AM »
I would definitely use DMLT in this situation.  It gives you resilient linking and redundancy in case of a 5520 failure.

TankII