Quick Steps for Configuring MSTIs Using 802.1Q 2005 Multiple Spanning Tree
page 2-18 OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008
Flat Mode MSTP with Superior MSTI 1 PPC Values
Note that of the two data paths available to MSTI 1 VLANs, one is still blocked because it is seen as
redundant for that instance. In addition, the CIST data path still remains available for CIST VLAN traffic.
Another solution to this scenario is to assign all VLANs to an MSTI, leaving no VLANs controlled by the
CIST. As a result, the CIST BPDU will only contain MSTI information. See “How MSTP Works” on
page 2-4 for more information.
2/1
3/1
4/2
4/8
5/2
5/1
||
VLAN 100
VLAN 250
MSTI-1
VLAN 200
VLAN 150
CIST-0
VLAN 100
VLAN 250
MSTI-1
VLAN 200
VLAN 150
CIST-0
||
2/12
3/6
Switch A Switch B
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