ATL Telecom R1-SW Ethernet Switch - Manual (Page 284)

R1-SW24L2B User’s Manual
13-26
Configuring RSTP Encoding
While STP calculates path cost using 16 bits (1~65,535), RSTP calculates path cost using 32 bits
(1~200,000,000). Therefore the path cost is not compatible between STP and RSTP. By default,
RSTP is enabled, so path cost of 32 bits are used in the Corecess R1-SW24L2B, but encoding of
path cost can generally be changed to 16 bits for STP compatible. To change path cost to 16 bits,
refer table 15-8 Configuring STP encoding mode. You can not configure the STP encoding mode
for individual VLANs and the change affects to all spanning trees.
To change path cost of 16 bits to path cost of 32 bits again, use the following commands.
Table 13-13 Configuring RSTP encoding mode
Command Task
configure terminal 1. Enter Global configuration mode.
stp pathcost-encoding
stp8021t2001
2. Configure the type of RSTP encoding mode.
end
3. Return to Privileged mode.
show stp vlan id
<vlan-id>
4. Verify the configuration result.
The following example shows how to configure the type of STP encoding mode to 32 bits:
(config)# stp pathcost-encoding stp8021t2001
(config)#