Cat3560: More than 128 SPT Instances?

Answered Question
Feb 19th, 2008

Hi everybody

In a secured VTP, we have many but small VLANS. But now we are hit by a Hardware Constraint: Our Switches (c3560G) can't handle more than 128 Spanning-Tree Instances. Reducing the Vlans is no option for our Security Audit, per-vlan-disabling of SPT (rstp to be exact) is no option for us either.

Is there any way to enhance the VLAN-Capactity of c3560-Switches (e.g. different IOS), or do we really have to either buy new Hardware or split the VTP into multiple Domains? If so - is there anywhere a comparison table, how many STP-Instances which Cisco-Switch can manage?

Currently used Hardware: WS-C3560G-48TS

Currently used Software: c3560-ipservicesk9-mz.122-25.SEE2.bin

Thx in advance and sorry for the bad english

Greetings from Bern, Switzerland

Stefan Mueller

Correct Answer by Lars Persson about 9 years 3 days ago

Hi

You can go for MSTP (Multiple spanning tree) which gives you the possibility to run several VLANs in the same spanning-tree instance. MSTP also run rapid spanning tree giving you the same convergence time as RSTP.

regs /Lars

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Correct Answer
Lars Persson Tue, 02/19/2008 - 05:30

Hi

You can go for MSTP (Multiple spanning tree) which gives you the possibility to run several VLANs in the same spanning-tree instance. MSTP also run rapid spanning tree giving you the same convergence time as RSTP.

regs /Lars

mullzkBern_2 Tue, 02/19/2008 - 10:23

Thanks a lot, somehow I thought RSTP would prohibit the use of MSTP. Now I have something to learn for the next few days :)

Still - Is there any place where Capabilities and Limitations of Cisco LAN Switches are directly compared, e.g. in one giant table? Does anything like this exist for IOS-Releases exist as well?

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