April | Dell 6200 specs

MSTP INTEROPERABILITY OF THE DELL™ POWERCONNECT™ 6200 SERIES SWITCHES WITH CISCO IOS AND CISCO CATOS-BASED SWITCHES

###### MST 2 Vlan Mapped: 20
ROOT ID	00:02:00:15:62:10:29:00
Address	00:02:00:15:62:10:29:00
Path Cost	20000
Root Port	1/g2
Hello Time	2 Sec
Max Age	20	sec
Forward Delay	15	sec
Bridge ID	32768
Priority	32768
Address	80:02:00:84:00:00:0F:FF
Hello Time	2 Sec
Max Age	20	sec
Forward Delay	15	sec

Interfaces
Name	State	Prio.Nbr	Cost	Sts	Role	PortFast	RootPort
------	-----	--------	-----	----	-----	--------	-------
1/g1	Enabled	128.1	20000	DSC	Altn	No	No
1/g2	Enabled	128.2	20000	FWD	Root	No	No
Dell_BrB#

ADDITIONAL INFORMATION AND SCALABILITY WITH MORE REGIONS

To further illustrate the full connectivity in an MSTP active topology, the following rules apply:

•Each Bridge or LAN is in one and only one MSTP region.

•Every frame is associated with one and only one VID.

•Frames are allocated either to the IST or MSTI within any given region.

•The IST and each MSTI provides full and simple connectivity between all LANs and bridges in a region.

•All bridges within a region reach a consistent agreement as to which ports interconnect that region to a different region and label those as boundary ports.

•At the boundary ports, frames allocated to the CIST or MSTIs are forwarded or not forwarded alike.

•The CIST provides full and simple connectivity between all LANs and bridges in the network.

Frames with VIDs not allocated to an + MSTI will be implicitly assigned to the CIST (or IST within the region), and they will be processed or passed on through the region. For example, in Figure 7, VLAN 30 is not explicitly assigned to any instance but by default, it will still rely on the CIST since the two bridges define a region (MST Region 2). Since the two bridges process frames internal to Region 2, an MSTI Regional Root Bridge must again be elected. In this example, Bridge BrA2 is chosen since it has the lowest external root path cost through a boundary port.

APRIL 2008