Layer 2 Lan Port Modes - Cisco 6500 Series Software Configuration Manual
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Also See for 6500 Series:
- Configuration manual (392 pages) ,
- Configuration note (212 pages) ,
- Installation manual (194 pages)
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Understanding How Layer 2 Switching Works
Encapsulation Types
Table 7-1
Table 7-1
Encapsulation
switchport trunk encapsulation isl
switchport trunk encapsulation dot1q
switchport trunk encapsulation negotiate
The trunking mode, the trunk encapsulation type, and the hardware capabilities of the two connected
LAN ports determine whether a link becomes an ISL or 802.1Q trunk.
Layer 2 LAN Port Modes
Table 7-2
Table 7-2
Layer 2 LAN Port Modes
Mode
switchport mode access
switchport mode dynamic desirable
switchport mode dynamic auto
switchport mode trunk
switchport nonegotiate
Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
7-4
lists the Ethernet trunk encapsulation types.
Ethernet Trunk Encapsulation Types
lists the Layer 2 LAN port modes and describes how they function on LAN ports.
Function
Puts the LAN port into permanent nontrunking mode and negotiates to convert the
link into a nontrunk link. The LAN port becomes a nontrunk port even if the
neighboring LAN port does not agree to the change.
Makes the LAN port actively attempt to convert the link to a trunk link. The LAN
port becomes a trunk port if the neighboring LAN port is set to trunk, desirable, or
auto mode. This is the default mode for all LAN ports.
Makes the LAN port willing to convert the link to a trunk link. The LAN port
becomes a trunk port if the neighboring LAN port is set to trunk or desirable mode.
Puts the LAN port into permanent trunking mode and negotiates to convert the link
into a trunk link. The LAN port becomes a trunk port even if the neighboring port
does not agree to the change.
Puts the LAN port into permanent trunking mode but prevents the port from
generating DTP frames. You must configure the neighboring port manually as a
trunk port to establish a trunk link.
Chapter 7
Configuring LAN Ports for Layer 2 Switching
Function
Specifies ISL encapsulation on the trunk link.
10-Gigabit Ethernet ports do not support
Note
ISL encapsulation.
Specifies 802.1Q encapsulation on the trunk link.
Specifies that the LAN port negotiate with the
neighboring LAN port to become an ISL
(preferred) or 802.1Q trunk, depending on the
configuration and capabilities of the neighboring
LAN port.
78-14099-04
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Troubleshooting
