Daisy Chain Limit on Switches

Answered Question
Feb 10th, 2008
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I have 5 48-port 2960 switches (50 counting the 2 GB ports). I want to uplink them on the GB ports.


Is there a daisy chain limit on switches like there is on hubs?


Thanks,


Denny



Correct Answer by Edison Ortiz about 9 years 1 month ago

No hard limit, but you want to maximize the uplink ports so I suggest the attached layout.


The green links are traffic being forwarded towards the root. The red link indicate port being blocked in order to avoid a SPT loop.


HTH,


__


Edison.





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JORGE RODRIGUEZ Sun, 02/10/2008 - 15:12
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Denny, I do not believe you can daisy chain 2960 switches, instead you may use clustering technology to accomplish what you need, you could have up to 16 devices in a switch cluster.


Switch Clusterining

http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_40_se/configuration/guide/swclus.html#wp1193472


Rgds

Jorge

Correct Answer
Edison Ortiz Sun, 02/10/2008 - 15:20
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No hard limit, but you want to maximize the uplink ports so I suggest the attached layout.


The green links are traffic being forwarded towards the root. The red link indicate port being blocked in order to avoid a SPT loop.


HTH,


__


Edison.





Joseph W. Doherty Sun, 02/10/2008 - 16:54
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No, not like hubs.


If using spanning tree based on the STP 802.1D standard, you're not supposed to have, I believe, more than 7 hops. (That's for worst case performance and hopefully you would use a newer spanning tree standard, e.g. RSTP 802.1W.)


nickyfang Sun, 02/10/2008 - 17:49
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Hi Joseph,


Out of curiosity, any particular reasons why is it 7 hops? Thank you.


Joseph W. Doherty Sun, 02/10/2008 - 17:54
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Something to do with timing dependencies, I believe.

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