Reference Guide

Usage Information The network device maintains static MAC address entries saved in the startup conguration le, and reboots and
ushes dynamic entries.
Example (Address)
OS10# show mac address-table address 90:b1:1c:f4:a6:8f
VlanId Mac Address Type Interface
1 90:b1:1c:f4:a6:8f dynamic ethernet1/1/3
Example (Aging
Time)
OS10# show mac address-table aging-time
Global Mac-address-table aging time : 1800
Example (Count)
OS10# show mac address-table count
MAC Entries for all vlans :
Dynamic Address Count : 5
Static Address (User-defined) Count : 0
Total MAC Addresses in Use: 5
Example (Dynamic)
OS10# show mac address-table dynamic
VlanId Mac Address Type Interface
1 90:b1:1c:f4:a6:8f dynamic ethernet1/1/3
Example (Ethernet)
OS10# show mac address-table interface ethernet 1/1/3
VlanId Mac Address Type Interface
1 66:38:3a:62:31:3a dynamic ethernet1/1/3
Supported Releases 10.2.0E or later
Multiple Spanning-Tree Protocol
Multiple Spanning-Tree Protocol (MSTP) is an RSTP-based spanning-tree variation that improves on per-VLAN RPVST+. You can congure
Multiple Spanning-Tree Instances (MSTIs) and map multiple VLANs to one spanning-tree instance to reduce the total number of required
instances. RPVST+ allows a spanning-tree instance for each VLAN. This 1:1 approach is not suitable if you have multiple VLANs — each
spanning-tree instance costs bandwidth and processing resources.
When you enable MST, all ports in Layer 2 mode participate in MST. Keep in mind that OS10 only supports one MST region.
Load balancing can be achieved using the MSTP. When three VLANs are mapped to two MSTIs, VLAN 100 trac takes a dierent path
than VLAN 200 and 300 trac.
Conguring MST is a four-step process:
1 Enable MST, if the current running STP version is not MST.
2 (Optional) Map the VLANs to dierent instances to achieve load balancing.
Layer 2
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