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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Any 1U - 2U Ethernet switches that can handle 4K VLANs?
welcome to 2004. ISL is a thing of the past. let us move on. ./end_flamebait.sh -J (who realized Cisco no longer supports ISL on 2950 and some other newer box) On Mon, Jan 26, 2004 at 11:09:07PM -0800, Alexei Roudnev wrote: > > So what? Is is a sugnificant drawback? I do not think so. Both ISL and > 802.1q require special interface cards (with extended frame size), and I do > not see any reason, why 26 bytes vs 4 bytes makes big difference. /May be, > the only pro for 802.1q tagging is it's possible implementation on the old > interface cards, which did not allowed extra 30 bytes but allowed extra 4 > bytes/. > > I am no saying that ISL is better tha 802.1q, but 802.1q is not much better > than ISL, and (in some cases) is even worst. > > > ----- Original Message ----- > From: <[email protected]> > To: <[email protected]> > Cc: <[email protected]> > Sent: Monday, January 26, 2004 9:10 AM > Subject: Re: Any 1U - 2U Ethernet switches that can handle 4K VLANs? > > > > > ISL _DOES NOT CHANGE_ packet size. > > > > An 802.1q tag adds 4 bytes to the Ethernet frame. > > > > ISL encapsulation adds 30 bytes to the Ethernet frame. > > > > Steinar Haug, Nethelp consulting, [email protected] -- James Jun (formerly Haesu) TowardEX Technologies, Inc. 1740 Massachusetts Ave. Boxborough, MA 01719 Consulting, IPv4 & IPv6 colocation, web hosting, network design & implementation http://www.towardex.com | [email protected] Cell: (978)394-2867 | Office: (978)263-3399 Ext. 170 Fax: (978)263-0033 | AIM: GigabitEthernet0 NOC: http://www.twdx.net | POC: HAESU-ARIN, HDJ1-6BONE
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