A10E/A28E/A28F Configuration Guide
The maximum hop count of MST domain is used to restrict domain scale, while network
diameter is a parameter to denote the whole network scale. The bigger the network diameter is,
the bigger the network scale is.
Similar to the maximum hop count of MST domain, if and only if configuring the
A10E/A28E as CIST root device, this configuration is effective. MSTP will automatically set
Hello Time, Forward Delay and Max Age parameters to a privileged value by calculation
when configuring network diameter.
Configure network diameter for switch network for the A10E/A28E as below.
Enter global configuration mode.
Alpha-A28E(config)#spanning-tree
bridge-diameter
bridge-diameter-
value
Configure diameter for switch
network.
7.5.9 Configuring inner path overhead for interfaces
When selecting root port and designated port, the smaller the interface path cost is, the easier
it is to be selected as root port or designated port. Inner path costs of interface are
independently mutually in different instances. You can configure inner path cost for instance
through parameter instance instance-id. Configure inner path cost of interface for CIST if
instance-id is 0 or parameter instance instance-id is omitted.
By default, interface cost often depends on the physical features:
10 Mbit/s: 2000000
100 Mbit/s: 200000
1000 Mbit/s: 20000
10 Gbit/s: 2000
Configure inner path cost for the A10E/A28E as below.
Enter global configuration mode.
Alpha-A28E(config)#interface port
port-id
Enter physical layer interface
configuration mode.
Alpha-A28E(config-port)#spanning-
tree [ instance
instance-id
]
inter-path-cost
cost-value
Configure inner path cost for
interface.
7.5.10 Configuring external path cost for interface
External path cost is the cost from the device to CIST root, which is equal in the same domain.
Configure external path cost for the A10E/A28E as below.
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