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Should we use ISL or 802.1 Q for Trunking - Cisco Devices

Trunking is a way to carry traffic from several VLANs over a point-to-point link between the two devices.

Two ways in which Ethernet trunking can be implemented are:

1) ISL - InterSwitch Link

(Cisco proprietary protocol, and not supported by the 2940 or 2950 series switches)

2) 802.1Q (Institute of Electrical and Electronics Engineers (IEEE) standard)


For Catalyst 2900XL/3500XL/2940/2950/2970 Switches:


Catalyst 2940 and 2950 series switches only support 802.1q trunking, and do not support ISL trunking.

On a 4 MB DRAM Catalyst 2900XL switch, trunking is only supported with the following trunking-capable modules:

WS-X2914-XL-V: 4-port 10/100 ISL/802.1Q switch module
WS-X2922-XL-V: 2-port 100BaseFX ISL/802.1Q switch module
WS-X2924-XL-V: 4-port 100BaseFX ISL/802.1Q switch module
WS-X2931-XL: 1000BaseX uplink for Catalyst 2900 XL
WS-X2932-XL: 1000BaseT uplink for Catalyst 2900 XL

To get the compactability chart please refer;

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a00800949fd.shtml

Note:

The benefits of using dot1q is that you can connect non-cisco devices with a cisco device, ISL is CISCO proprietary so you're not able to connect other switches that are non-cisco. You can use the one you like as long as you're consistent and use the same on the link.

Regards

Avinash Pillai

URL : http://avinashpillai.blogspot.com
Email: avinashp[AT]aztecsoft[DOT]com, avinashp25[AT]gmail[DOT]com

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