Cisco is moving towards 802.1q as: 1) Standard 2) Native VLAN allows non-trunking aware devices to participate 3) Lower overhead
802.1q is slightly less secure as there is a native VLAN. This could be a concern as packets injected into the trunk will be allowed and could be used for an attack vector. Of course, both ISL and .q have had security breaches. --- James Wilson wrote: > On this same subject, how secure or how vulnerable > is ISL or dot1q trunking? > Is it vulnerable to arp attacks? > > -- > James D. Wilson, CCDA, MCP > Sr. Network/Security Engineer > "non sunt multiplicanda entia praeter necessitatem" > William of Ockham (1285-1347/49) > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of > Chuck Larrieu > Sent: Wednesday, January 30, 2002 4:09 PM > To: [EMAIL PROTECTED] > Subject: Re: How prevalent is ISL in the "real > world"? [7:33758] > > > It might be an issue of installed base, or lack > thereof. I believe recent > CatOS releases have corrected this, but for a long > while, the Cat 400x > series did ISL on trunks, while doing 802.1q on > ports. Older boxes, of > course, may only do ISL. > > In these days of tight budgets it can be difficult > to convince customers to > upgrade > > absolutely, everyone should upgrade to the open > standard. absolutely, > everyone should migrate from token ring to ethernet. > absolutely, everyone > should eliminate native IPX, NetBEUI, and AppleTalk > from their networks. ;-> > > Chuck > > > ""Peter van Oene"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > What are the current advantages for running ISL > over 802.1q? I would > > expect its proprietary nature to be enough to > warrant choosing against it. > > > > Pete > > > > > > At 03:47 PM 1/30/2002 -0500, you wrote: > > >Is ISL still widely used? Are there still many > shops out there using it? > (I > > >assume Cisco only outfits) It seems that Cisco > has all but dropped > support > > >for it in favor of dot1q. > > > > > >Sean [EMAIL PROTECTED] ===== Robert Padjen __________________________________________________ Do You Yahoo!? Great stuff seeking new owners in Yahoo! Auctions! http://auctions.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=33822&t=33758 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
