10-31-2008 03:44 PM - edited 03-06-2019 02:15 AM
Hi,
I have smal query that what is the diffrence between mentioned protocols
CST,STP,RSTP,PVST,PVST+,RPVST,RPVST+
1)on above mentioned protocol which one is cisco Proprietary protocol
2) If i enable RPVST in my core swtcihes(Cisco)..Which spanning tree need to enable in non cisco products(Access switches)..
Regards
sateesh
10-31-2008 04:02 PM
Hello Sateesh,
1)
CST = IEEE STP 802.1D single instance
STP generic can be IEEE, IBM or DEC
RSTP = 802.1W Rapid STP
PVST = cisco prop
PVST+= cisco propr. one STP instance for each Vlan
RPVST = cisco propr. one Rapid STP instance for each Vlan
MST = 802.1S multi instance STP uses a Rapid STP instance for each configured group of Vlans that share the same topology
2)
You have two options:
use PVST+ on core switches and CST on access switches
or
use MST on core switches and access switches if all of them support it
Hope to help
Giuseppe
10-31-2008 04:06 PM
Just to add to Giuseppe's excellent post
PVST = Cisco proprietary. One STP instance per vlan. Works with ISL trunks.
PVST+ = Cisco proprietary. One STP instance per vlan. Works with 802.1q trunks.
Jon
10-31-2008 07:53 PM
Hi..
Thanks for ur immediate respond....
I wolud like to enable RPVST in my core switches...
Which type spanning tree need to enable in non cisco products(Nortal switch)
Give any suggestion in this scenario..
Thanks
Sateesh
11-03-2008 02:49 PM
Hi,
Could you pls reply to my query..
Thanks in advance..
Regards
sateesh
11-04-2008 12:25 AM
Hello Sateesh,
I thought I had already answered in my first post.
However:
because RPVST is Cisco proprietary on the Nortel switches you can probably run only the old 8021.D CST.
To take advantage of 802.1W Rapid spanning tree you should use MST 802.1S on both Cisco switches and Nortel switches.
As a reference you can use the following document:
Hope to help
Giuseppe
11-04-2008 01:55 AM
Hi, Depending on the Nortel switch, age etc, the newer ones support 802.1w, the older ones support 802.1d.
With Nortel, by default there is one single spanning tree instance for all vlan, You can create another instance and then assign vlans to it, this is for both STP and RSTP.
HTH
Carl
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