Default Stp Configuration; Stp And Mst Configuration Guidelines - Cisco 7609 Configuration Manual

Chapter 15 Configuring STP and IEEE 802.1s MST

Default STP Configuration

Table 15-5
Table 15-5 STP Default Configuration
Feature
Enable state
Bridge priority
STP port priority (configurable on a per-port
basis—used on LAN ports configured as
Layer 2 access ports)
STP port cost (configurable on a per-port
basis—used on LAN ports configured as
Layer 2 access ports)
STP VLAN port priority (configurable on a
per-VLAN basis—used on LAN ports
configured as Layer 2 trunk ports)
STP VLAN port cost (configurable on a
per-VLAN basis—used on LAN ports
configured as Layer 2 trunk ports)
Hello time
Forward delay time
Maximum aging time
Mode

STP and MST Configuration Guidelines

Follow these guidelines when configuring MST:
•
•
•
78-14064-04
shows the default STP configuration.
Do not disable spanning tree on any VLAN in any of the PVST bridges.
Do not use PVST bridges as the root of CST.
Ensure that all PVST spanning tree root bridges have lower (numerically higher) priority than the
CST root bridge.
Default Value
STP enabled for all VLANs
32768
128
• 10-Gigabit Ethernet: 2
• Gigabit Ethernet: 4
• Fast Ethernet: 19
Ethernet: 100
•
128
10-Gigabit Ethernet: 2
•
Gigabit Ethernet: 4
•
Fast Ethernet: 19
•
• Ethernet: 100
2 seconds
15 seconds
20 seconds
PVST
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
Default STP Configuration
15-21