How prevalent is ISL in the "real world"? [7:33758]
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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=33758&t=33758 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: How prevalent is ISL in the "real world"? [7:33758]
There are lots of ISL trunks still working, if it ain't broke... But yes the direction is dot1q and I have been suggesting customers consider dot1q on new installs. The original argument, dot1q does not support per VLAN spanning, is no longer valid. Dave Sean Knox 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 -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 "Emotion should reflect reason not guide it" Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=33763&t=33758 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: How prevalent is ISL in the "real world"? [7:33758]
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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=33773&t=33758 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: How prevalent is ISL in the "real world"? [7:33758]
We have an older Cat5k sitting in our Quality Assurance lab, and I was considering performing some tests for work with ISL... in this case, the supervisor engine is too old to run dot1q. I was just curious on how many companies still use ISL, be it exclusively or with dot1q. - Sean -Original Message- From: Peter van Oene [mailto:[EMAIL PROTECTED]] Sent: Wednesday, January 30, 2002 2:15 PM To: [EMAIL PROTECTED] Subject: Re: How prevalent is ISL in the "real world"? [7:33758] 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=33781&t=33758 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=33780&t=33758 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: How prevalent is ISL in the "real world"? [7:33758]
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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=33795&t=33758 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: How prevalent is ISL in the "real world"? [7:33758]
David C Prall [EMAIL PROTECTED] http://dcp.dcptech.com - Original Message - From: "Peter van Oene" To: Sent: Wednesday, January 30, 2002 5:15 PM Subject: Re: How prevalent is ISL in the "real world"? [7:33758] > 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=33803&t=33758 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: How prevalent is ISL in the "real world"? [7:33758]
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]
