Reply To: Stratrix 5700

AdminFred Graham
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Hi Raj, glad we’re getting somewhere. Yes, the Stratix 5700 supports three different spanning tree protocols. I have implemented in different mesh type scenarios with Cisco backbone switches. The three Spanning Tree protocols are as follows:

Multiple Spanning Tree Protocol (MSTP) based on the IEEE 802.1s standard. MSTP uses Rapid Spanning Tree Protocol (RSTP) for rapid convergence. This mode maps a group of VLANs into a single spanning tree instance, with each instance having a spanning tree topology independent of other spanning tree instances. This architecture provides multiple forwarding paths for data traffic, enables load balancing, and reduces the number of spanning tree instances required to support a large number of VLANs. MSTP is the default STP mode.

Per VLAN Spanning Tree Plus (PVST+) protocol based on the IEEE 802.1D standard. PVST+ runs on each VLAN on the switch up to the maximum supported, to help create a loop-free path through the network. PVST+ provides Layer 2 load balancing for the VLAN on which it runs. You can create different logical topologies by using the VLANs on your network to make sure that all of your links are used but that no one link is oversubscribed. Each instance of PVST+ on a VLAN has a single root switch. This root switch propagates the spanning-tree information associated with that VLAN to all other switches in the network. Because each switch has the same information about the network, this process maintains the network topology.

Rapid per VLAN Spanning Tree Plus (Rapid PVST+) protocol based on the IEEE 802.1w standard. RPVST+ is the same as PVST+ except that is uses a rapid convergence based on the IEEE 802.1w standard. To provide rapid convergence, the rapid PVST+ immediately deletes dynamically learned MAC ID entries on a per-port basis upon receiving a topology change. By contrast, PVST+ uses a short aging time for dynamically learned MAC ID entries. Only one version can be active on the switch at any time. For example, all VLANs run PVST+, all VLANs run rapid PVST+, or all VLANs run MSTP.

I’m not familiar with the GE switch you speak of, but as long as it supports one of these standards you shouldn’t have any problems. Here is a link to the full Stratix User Manual.