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https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-2950-series-switches/prod_qas09186a008009258e.html
Mar 28, 2006 · No. The Cisco Catalyst 2950 Series does not support ISL trunking, and there are no plans to support it on the Cisco Catalyst 2950 Series platform. For customers with a requirement to deploy ISL trunking, the Cisco Catalyst 3560 Series supports both ISL and 802.1Q trunks.
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 modes only with Cisco …
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 …
https://www.cisco.com/c/en/us/support/docs/lan-switching/inter-switch-link-isl/24066-174.html
Jul 13, 2016 · The Command Line Interface (CLI) (similar to the Cisco IOS ® CLI) is only available on the Enterprise image of the Catalyst 1900. Note: Catalyst 4000 series switches, with Supervisor I and II, and Catalyst 2950 series switches do not support ISL trunking and cannot be connected to the Catalyst 1900. Catalyst 5500 switches support ISL on ...
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/23408-140.html
Nov 16, 2007 · If a device on one side of the channel does not support PAgP, such as a router, the device on the other side must have PAgP set to on. Catalyst 2950 switches support PAgP for channel negotiation with Cisco IOS Software Release 12.1(6)EA2 or later. Cisco IOS Software Release 12.0 supports only static configuration.
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://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://community.cisco.com/t5/other-network-architecture/trunk-between-2600-and-2950-with-ios/td-p/325695
Dec 27, 2004 · This seems very strange to me. Are you sure it is a 2950-12? It seems to be behaving more like a 2912XL. AFAIK, 2950 does not support ISL because of a hardware limitation - something to do with the ASICs. OTOH, 2912XL did default to ISL. Kevin Dorrell. Luxembourg
https://community.cisco.com/t5/switching/2950-encapsulation/td-p/670361
Cisco 2950 support only 802.1Q and not ISL trunking protocol, hence 2950 won't take switchport trunk encap dot1q command. Once you have confgured fe0/24 as trunk port, it will take 802.1q as trunking protocol by itself. you can verify the same by "show interface fe0/24 trunk" command.
https://community.cisco.com/t5/other-network-architecture/trunking-protocol-in-cat2950/td-p/363947
It is my understanding that on top of hardware limitations that prevent the 2950 from supporting ISL, Cisco in general is doing away with ISL. One reason I have heard is that since ISL tags all packets and does not support "native VLAN" which is vital for VoIP apps they are doing away with ISL to facilitate VoIP in the future.
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