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https://www.cisco.com/c/en/us/support/docs/lan-switching/inter-vlan-routing/14976-50.html
Nov 22, 2005 · This document provides sample configurations on InterSwitch Link (ISL) and 802.1Q trunking between a Catalyst 3512-XL switch and a Cisco 2600 router; the results of each command are displayed as they are executed. Cisco 3600 and 4500/4700 series routers, or other members of the Cisco 2600 series routers, with FastEthernet interfaces, and any Catalyst 2900XL, 3500XL, 2940, 2950 or …
https://www.cisco.com/c/en/us/support/docs/lan-switching/etherchannel/22422-144.html
Feb 26, 2006 · Catalyst 2950. Catalyst 2950 switches only support 802.1Q trunking and do not support ISL trunking. Catalyst 2950 switches support DTP and PAgP dynamic trunking and channel negotiation with Cisco IOS Software Release 12.1 releases and static …
https://community.cisco.com/t5/other-network-architecture/isl-trunk-non-supported-by-catalyst-2950-why/td-p/104330
There is one solution, although it is a bit of a pain. Put a isl/dot1q capable device (like a 2900XL) between the 2950 and 1900. This way you can ISL from 1900 to 2900XL, then dot1q from 2900XL to 2950. I know this is not ideal, but Cisco say they have no plans to support ISL on the 2950 ! Daniel,
https://community.cisco.com/t5/networking-documents/how-to-configure-trunking-on-the-catalyst-2900xl-3500xl-2950-or/ta-p/3124070
Note: The steps to configure trunking on the Catalyst 2950 or 3550 series are almost the same. The 2950/2955 series switches do not require step 4, as they only support 802.1q and do not support ISL trunk encapsulation. Cisco Catalyst 3550 Series switches support both ISL and 802.1Q trunks.
https://learningnetwork.cisco.com/thread/66619
Apr 14, 2015 · If the command doesn't exist, then I would have to conclude that the 2950 is running software that no longer supports ISL and thus, dot1q is the default and only option. Newer switches won't support ISL, some switches stopped supporting it as of certain IOS versions. Others still support it even with newer versions.
https://support.hpe.com/hpsc/doc/public/display?docId=c02831684
On the Catalyst 2950 LRE switch, the SFP module slots support the SFP modules listed in the Catalyst 2950 LRE switch release notes. The Catalyst 2950 LRE switch has four physical input ports that are logically bundled as two ports. Each logical port consists of a copper 10/100/1000 port and a fiber-optic SFP module slot.
https://learningnetwork.cisco.com/thread/85518
Jun 22, 2015 · Most newer Cisco Switches don't support ISL. The 2950 Switch does not support ISL and by default it supporting the 802.1q trunking protocol. For instance if you connect two 2950 switches using fa0/1 on both switches, just issue the commands on …
https://www.akdpr.org/forums/topic/cisco-catalyst-2950-switch-user-guide/
Feb 15, 2018 · View and Download Cisco Catalyst 2950 getting started manual online. Catalyst 2950 Switch pdf manual download.15 Feb 2018 The Catalyst 2950 switch does not support ISL-tagged packets. If the switch receives an ISL-tagged packet, the packet is flooded in the native The Catalyst 2950 Desktop Switch Software Configuration Guide is for the network ...
https://arstechnica.com/civis/viewtopic.php?t=518089
Jun 23, 2004 · Cisco Switch Comparisson: 2950 vs 3550 ... while the 3550 and up support both 802.1q (standard) and ISL (Cisco). I spent quite a frustrating hour wondering why the 2950's would not trunk using ISL.
https://hardforum.com/threads/cisco-2924-vs-2950.1171706/
Mar 29, 2007 · Far as I know, 2950's dont support ISL even in the latest release, and it isn't on the roadmap. 2970's support ISL and dot1q, I'm not sure about the 2960's though. 3550's do support ISL as well. If you can configure dot1q, you can configure ISL (as long as you know how to use ?) .
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