RE: Spanning-Tree forward delay

Uplink fast is a feature that allows faster convergence of the spanning tree
when it has root port candidates in blocked state. It will start forwarding
immediately on the new root port upon the failure of the uplink. The meaning
of this is different from listening and learning, since the port is already
known to be on the path to the root, but is currently blocked by the
algorithm. The new convergency procedures will run as the port is already
forwarding (configuration PDU, etc.).

Portfast would completely skip listening and learning. You need to be
careful there, and know what is connected to the port and what could be
connected to the port.

Forward delay would do the job, it needs an assessment upon how small the
value can be based on the complexity of the network. This parameter should
be set on a root bridge for the VLAN, otherwise it will not take effect.

Cheers,

Adel Abouchaev, CCIE# 12037, CISSP, MCSE

Netmasterclass LLC, Cisco Learning Partner
RFC821: adel_at_netmasterclass.net
E.164: +18886772669
HTTP: www.netmasterclass.net

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
ccie_ka_at_gmx.de
Sent: Monday, February 01, 2010 11:47 PM
To: ccielab_at_groupstudy.com
Subject: Spanning-Tree forward delay

Hi group,

I know that this subject are often discussed. But for me is not clear if a
question ask:
How to reduce the listening and learning state in spanning-tree.
My first thing that I can do is "spanning-tree vlan <id> forward-delay <sec>
and also spanning-tree portfast
But what about uplink-fast ? Shuldn't this also a solution ?

Regards

Dennis

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