Cisco 7604

10-5
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 10 Configuring LAN Ports for Layer 2 Switching
Default Layer 2 LAN Interface Configuration
Default Layer 2 LAN Interface Configuration
Table 10-3 shows the Layer 2 LAN port default configuration.
Layer 2 LAN Interface Configuration Guidelines and Restrictions
When configuring Layer 2 LAN ports, follow these guidelines and restrictions:
• The following switching modules do not support ISL encapsulation:
– WS-X6502-10GE
– WS-X6548-GE-TX, WS-X6548V-GE-TX, WS-X6548-GE-45AF
– WS-X6148-GE-TX, WS-X6148V-GE-TX, WS-X6148-GE-45AF
Table 10-3 Layer 2 LAN Interface Default Configuration
Feature Default
Interface mode:
• Before entering the switchport command Layer 3 (unconfigured)
• After entering the switchport command switchport mode dynamic desirable
Trunk encapsulation switchport trunk encapsulation negotiate
Allowed VLAN range VLANs 1 to 4094, except reserved VLANs (see
Table 14-1 on page 14-2)
VLAN range eligible for pruning VLANs 2 to 1001
Default access VLAN VLAN 1
Native VLAN (for 802.1Q trunks) VLAN 1
Spanning Tree Protocol (STP) Enabled for all VLANs
STP port priority 128
STP port cost
• 100 for 10-Mbps Ethernet LAN ports
• 19 for 10/100-Mbps Fast Ethernet LAN ports
• 19 for 100-Mbps Fast Ethernet LAN ports
• 4 for 1,000-Mbps Gigabit Ethernet LAN ports
• 2 for 10,000-Mbps 10-Gigabit Ethernet LAN
ports