Solved: Number of hops in a Gigabit Ethernet topology

emaillis · ‎05-26-2004

Hi,

I need to daisy chain a number of switches through GigabitEthernet (not Gigastack) links.

Does anybody has feedback on the maximum number of hops we can daisy chain?

Thanks in advance...

ddelchev · ‎06-04-2004

If you don't mean "Cluster" feature, it depends on your spanning tree configuration. Typically with 802.1d(or 802.1q/d - PVSTP) you can not have more than 7 switches. Otherwise you risk to have some troubles in some cases (it depends, in p2p links it is not so really true). With 802.1w or 802.1s you can have up to 40 switches (with Cisco 802.1s/MSTP it is better to use it only in closed enterprise, otherwise all STPs with different Root bridges will be blocked). Without STP (with chain) you have no any limitations

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vmoopeung · ‎06-01-2004

I think you can configure maximum of 16 switches in a cluster with one command switch and others as member switches. you need to have special configurations which comes under cluster command in the switch . Maximum of 7 hops can be permitted to reach the command switch from the edge member switch

ddelchev · ‎06-04-2004

If you don't mean "Cluster" feature, it depends on your spanning tree configuration. Typically with 802.1d(or 802.1q/d - PVSTP) you can not have more than 7 switches. Otherwise you risk to have some troubles in some cases (it depends, in p2p links it is not so really true). With 802.1w or 802.1s you can have up to 40 switches (with Cisco 802.1s/MSTP it is better to use it only in closed enterprise, otherwise all STPs with different Root bridges will be blocked). Without STP (with chain) you have no any limitations

emaillis · ‎07-26-2004

OK, that's what I needed to know.thanks!

ns88_mrol · ‎09-15-2004

Could you point me some paper, telling about distance of 40 bridges betwen switches ?