Considerations for sharing private layer 2 networks
How to configure ISL / E-port using CLI and Device Manager – Connectrix Cisco MDS - YouTube
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7-4 VLAN Trunking: ISL and 802.1Q - Free CCNA Study Guide
Cisco Engineering - VLAN Trunk Port: Which carries the multiple vlan information. Trunk ports mark frames with unique identifying tags – either 802.1Q tags or Inter-Switch Link (ISL) tags – as they