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тАО02-14-2008 10:05 PM
тАО02-14-2008 10:05 PM
MSTP doesn't distribute VLANs?
Hi,
I have a single 2824 with two switches hanging off it that also have a link between them.
I have enabled MSTP to protect 3 VLANs as per output below.
However what I really want to do is block VLANs 1&2 on link A, and block VLAN 3 on link B. Instead what it does it block them all on link A. I would have thought you could set a priority per port for each MST Instance so that it knows which port to defer to for each individual instance?
Have you seen this? Am I missing something?
Thanks,
Simon.
switchA# sh span mst-config
MST Configuration Identifier Information
MST Configuration Name : Lab MSTP single
MST Configuration Revision : 1
MST Configuration Digest : 0xC01D53FBD2A3B9551DDB68FFF002D8FA
IST Mapped VLANs : 1
Instance ID Mapped VLANs
----------- ---------------------------------------------------------
1 2
2 3
switchA# sh span instance 1
MST Instance Information
Instance ID : 1
Mapped VLANs : 2
Switch Priority : 32768
Topology Change Count : 1
Time Since Last Change : 107 mins
Regional Root MAC Address : 0016b9-0b0be0
Regional Root Priority : 32768
Regional Root Path Cost : 0
Regional Root Port : This switch is root
Remaining Hops : 20
Designated
Port Type Cost Priority Role State Bridge
----- --------- --------- -------- ---------- ---------- -------------
1 100/1000T Auto 128 Disabled Disabled
Trk1 20000 128 Designated Forwarding 0016b9-0b0be0
Trk2 20000 128 Backup Blocking 0016b9-0b0be0
I have a single 2824 with two switches hanging off it that also have a link between them.
I have enabled MSTP to protect 3 VLANs as per output below.
However what I really want to do is block VLANs 1&2 on link A, and block VLAN 3 on link B. Instead what it does it block them all on link A. I would have thought you could set a priority per port for each MST Instance so that it knows which port to defer to for each individual instance?
Have you seen this? Am I missing something?
Thanks,
Simon.
switchA# sh span mst-config
MST Configuration Identifier Information
MST Configuration Name : Lab MSTP single
MST Configuration Revision : 1
MST Configuration Digest : 0xC01D53FBD2A3B9551DDB68FFF002D8FA
IST Mapped VLANs : 1
Instance ID Mapped VLANs
----------- ---------------------------------------------------------
1 2
2 3
switchA# sh span instance 1
MST Instance Information
Instance ID : 1
Mapped VLANs : 2
Switch Priority : 32768
Topology Change Count : 1
Time Since Last Change : 107 mins
Regional Root MAC Address : 0016b9-0b0be0
Regional Root Priority : 32768
Regional Root Path Cost : 0
Regional Root Port : This switch is root
Remaining Hops : 20
Designated
Port Type Cost Priority Role State Bridge
----- --------- --------- -------- ---------- ---------- -------------
1 100/1000T Auto 128 Disabled Disabled
Trk1 20000 128 Designated Forwarding 0016b9-0b0be0
Trk2 20000 128 Backup Blocking 0016b9-0b0be0
2 REPLIES 2
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тАО02-14-2008 11:17 PM
тАО02-14-2008 11:17 PM
Re: MSTP doesn't distribute VLANs?
Oh right I think I've got it - misread a bit of the manual. Priority 8 is the default, so I set the ones I want to have priority to 7, something like:
span instance 1 Trk1 priority 7
span instance 2 Trk2 priority 7
This the way for instances, but for the IST I'm not sure how you set a priority. Is it just a normal port priority? Not too worried about that though.
span instance 1 Trk1 priority 7
span instance 2 Trk2 priority 7
This the way for instances, but for the IST I'm not sure how you set a priority. Is it just a normal port priority? Not too worried about that though.
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тАО02-16-2008 02:09 PM
тАО02-16-2008 02:09 PM
Re: MSTP doesn't distribute VLANs?
So I guess the next question is:
- can you set TX/RX priorities? So one trunk takes all TX for VLAN 2 say, and the other trunk takes all RX for VLAN 2?
Cheers.
- can you set TX/RX priorities? So one trunk takes all TX for VLAN 2 say, and the other trunk takes all RX for VLAN 2?
Cheers.
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