Reference Guide

spanning-tree rstp
Sets the priority value for RSTP.
Syntax
spanning-tree rspt priority priority value
Parameters priority priority value — Enter a bridge-priority value in increments of 4096 (0 to 61440). Valid
priority values are: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056,
49152, 53248, 57344, and 61440. All other values are rejected.
Default Not configured
Command Mode CONFIGURATION
Usage
Information
RSTP determines the root bridge but you can assign one bridge a lower priority to increase the probability
it being the root bridge. A lower priority value increases the probability of the bridge becoming a
root bridge.
Example
OS10(config)# spanning-tree rstp priority 200
Supported
Releases
10.2.0E or later
Virtual LANs
VLANs segment a single flat L2 broadcast domain into multiple logical L2 networks. Each VLAN is uniquely identified by a VLAN
ID or tag consisting of 12 bits in the Ethernet frame. VLAN IDs range from 1 to 4093 and can provide a total of 4093 logical
networks.
You can assign ports on a single physical device to one or more VLANs creating multiple logical instances on a single physical
device. The virtual logical switches spanning across different physical devices emulate multiple logically segmented L2 networks
on a single physical network.
Each VLAN has its own broadcast domain and the unicast, multicast, and broadcast network traffic from ports that belong to
a VLAN is forwarded or flooded to ports in the same VLAN only. Traffic between VLANs must be routed from one VLAN to
another. You can also assign each VLAN an IP address to group all the ports within a single IP subnet.
Segment a L2 network using VLANs to:
● Minimize broadcast and multicast traffic in the L2 network
● Increase security by isolating ports into different VLANs
● Ease network management
Default VLAN
All interface ports are administratively up (in L2 mode) and are automatically placed in the default VLAN as untagged interfaces.
When you assign a port to a non-default VLAN in Trunk mode, the interface remains an untagged member of the default VLAN
and a tagged member of the new VLAN. When you assign a port to a non-default VLAN in Access mode, it removes from the
default VLAN and is assigned to the new VLAN as an untagged member of the new VLAN.
● VLAN 1 is the default VLAN.
● You cannot delete the default VLAN. However, you can change the default VLAN ID number using the default vlan-id
command.
Use the show vlan command to verify that the interface is part of the default VLAN (VLAN 1).
Default VLAN configuration
OS10# show vlan
Codes: * - Default VLAN, G-GVRP VLANs, R-Remote Port Mirroring VLANs, P-Primary, C-
Community, I-Isolated
Q: A-Access (Untagged), T-Tagged
x-Dot1x untagged, X-Dot1x tagged
G-GVRP tagged, M-Vlan-stack, H-VSN tagged
236
Layer 2