PLANET XGS3-24042 - Manual (Page 257)

14-103
100Mbps 200000 200000~2000000
1Gbps 20000 20000~200000
10Gbps 2000 2000~20000
For the aggregation ports, the default costs are as below:
Port Type Allowed Number Of Aggregation
Ports
Default Port Cost
10Mbps N 2000000/N
100Mbps N 200000/N
1Gbps N 20000/N
10Gbps N 2000/N
Usage Guide:
By setting the port cost, users can control the cost from the current port to the root bridge in order to
control the elections of port and the designated port of the instance.
Example:
On the port1/0/2, set the port cost is 3000000.
Switch(Config-If-Ethernet1/0/2)#spanning-tree cost 3000000
14.1.10 spanning-tree digest-snooping
Command:
spanning-tree digest-snooping
no spanning-tree digest-snooping
Function:
Configure the port to use the authentication string of partner port; the command “no spanning-tree
digest-snooping” restores to use the port generated authentication string.
Command mode:
Port Mode
Default:
Don’t use the authentication string of partner port.
Usage Guide:
According to MSTP protocol, the region authentication string is generated by MD5 algorithm with
public authentication key, intstance ID, VLAN ID. Some manufactory don’t use the public
authentication key, this causes the incompatibility. After the command is executed the port can use
the authentication string of partner port, realize compatibility with these manufactories equipment.
Note: Because the authentication string is related to instance ID and VLAN ID, the command may
cause recognizing the equipment that with different instance and VLAN relation as in the same
region. Before the command is executed, make sure that instance and VLAN relation is accord for