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Webcast-Catalyst9k
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Convert from ISL to 802.1q?

Hi All,

I have Multiple VLANS. We have eight 3548's uplinked to one 3508. All VLANs were configured using ISL. I want to convert the infrastructure to 802.1q to introduce some other vendors GIG switches. What should I watch out for and what are your recommendations? Is it as easy as changing the trunking type?

Thanks in advance,

Jerry Roy

949-221-7208

2 REPLIES
Cisco Employee

Re: Convert from ISL to 802.1q?

Make sure you configure both ends to be dot1q trunks and that Native VLAN matches.

http://www.cisco.com/warp/public/473/43.html

Re: Convert from ISL to 802.1q?

When connecting to other vendor switch via a 802.1q trunk, check if the other vendor supports the native VLAN feature (Cisco implemented but an option from IEEE 802.1q point of view).

Some vendors do support, but require manual setting (3Com, e.g.).

Some vendors don't support. You might use set dot1q-all-tagged enable CatOS command in that case, but I've never tried it and the Reference Guide is confusing (see http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/8_1/cmd_ref/set_a_d.htm#81881).

Regards,

Milan

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