Skip to main content

Should we use ISL or 802.1 Q for Trunking - Cisco Devices

Trunking is a way to carry traffic from several VLANs over a point-to-point link between the two devices.

Two ways in which Ethernet trunking can be implemented are:

1) ISL - InterSwitch Link

(Cisco proprietary protocol, and not supported by the 2940 or 2950 series switches)

2) 802.1Q (Institute of Electrical and Electronics Engineers (IEEE) standard)


For Catalyst 2900XL/3500XL/2940/2950/2970 Switches:


Catalyst 2940 and 2950 series switches only support 802.1q trunking, and do not support ISL trunking.

On a 4 MB DRAM Catalyst 2900XL switch, trunking is only supported with the following trunking-capable modules:

WS-X2914-XL-V: 4-port 10/100 ISL/802.1Q switch module
WS-X2922-XL-V: 2-port 100BaseFX ISL/802.1Q switch module
WS-X2924-XL-V: 4-port 100BaseFX ISL/802.1Q switch module
WS-X2931-XL: 1000BaseX uplink for Catalyst 2900 XL
WS-X2932-XL: 1000BaseT uplink for Catalyst 2900 XL

To get the compactability chart please refer;

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a00800949fd.shtml

Note:

The benefits of using dot1q is that you can connect non-cisco devices with a cisco device, ISL is CISCO proprietary so you're not able to connect other switches that are non-cisco. You can use the one you like as long as you're consistent and use the same on the link.

Regards

Avinash Pillai

URL : http://avinashpillai.blogspot.com
Email: avinashp[AT]aztecsoft[DOT]com, avinashp25[AT]gmail[DOT]com

Comments

Post a Comment

Popular posts from this blog

Seven Personal Qualities Found In A Good Leader

Whether in fact a person is born a leader or develops skills and abilities to become a leader is open for debate. There are some clear characteristics that are found in good leaders. These qualities can be developed or may be naturally part of their personality. Let us explore them further. Seven Personal Qualities Found In A Good Leader: 1. A good leader has an exemplary character. It is of utmost importance that a leader is trustworthy to lead others. A leader needs to be trusted and be known to live their life with honestly and integrity. A good leader “walks the talk” and in doing so earns the right to have responsibility for others. True authority is born from respect for the good character and trustworthiness of the person who leads.   2.A good leader is enthusiastic about their work or cause and also about their role as leader. People will respond more openly to a person of passion and dedication. Leaders need to be able to be a source of inspiration, and b...
1 comment
Read more

Defining AI Ethics

                           Defining AI Ethics Welcome to Defining AI Ethics. Humans rely on culturally agreed-upon morals and standards of action — or ethics — to guide their decision-making, especially for decisions that impact others. As AI is increasingly used to automate and augment decision-making, it is critical that AI is built with ethics at the core so its outcomes align with human ethics and expectations. AI ethics is a multidisciplinary field that investigates how to maximize AI's beneficial impacts while reducing risks and adverse impacts. It explores issues like data responsibility and privacy, inclusion, moral agency, value alignment, accountability, and technology misuse …to understand how to build and use AI in ways that align with human ethics and expectations.  There are five pillars for AI ethics: explainability, fairness,...
Post a Comment
Read more

Command to Find Version of Linux OS

Command to Find Version of Linux OS # cat /etc/redhat-release Regards Avinash Pillai URL : http://avinashpillai.blogspot.com Email: avinashp[AT]aztecsoft[DOT]com, avinashp25[AT]gmail[DOT]com
1 comment
Read more