On Wed, Sep 20, 2000 at 06:07:48PM +0800, Cho Man Fai wrote:
>
> Dear all,
>
> Can ISL and 802.1q trunk exist in the same network? Any workaround to do
Sure they can. One little detail - if you run VLANs with numbers higher than
1000 when you use 802.1q, you'll have to manually map them into lower numbers
when you need them to cross ISL trunk.
> so without changing the whole network to 802.1q? What's the pros and cons
> of the two trunking protocol?
802.1q is an industry standard, though not all cisco catalysts support it.
802.1q will support up to 4096 VLANs, where ISL will support only 1024 (or
1000? correct me if I'm wrong). ISL does not really care about "native VLAN"
for trunk port, 802.1q does - it must match on both sides of the trunk or
you'll get lost packets.
In general, the answer probably is "use 802.1q where you can, and ISL where
you must".
SY,
-- CCNP,CCDP (R&S) Dmitri E. Kalintsev CDPlayer@irc Chief of Network Operations @ Sonorous Networks dek @ hades.uz phone: +27 11-327-1524 fax: 327-7648 http://hades.uz UIN:7150410 cell +27 82-336-1033
This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:12:17 EDT