VLAN's in Network with both 2950 and 1900 Switches

rossua994 · ‎08-12-2007

Given that Catalyst 2950 switches support only 802.1q VLAN trunking, and Catalyst 1900 switches support only ISL VLAN trunking, can VLAN's be successfully used on a LAN which contains both of these switch types ?

ankbhasi · ‎08-12-2007

Hi Friend,

There is a problem here, you can configure vlans on both the switches but because both support different encapsulation type , trunk will not come up and traffic for those vlans will not pass other switch.

HTH

Ankur

yaroslavrosomakho · ‎08-13-2007

You can't connect directly 2950 with 1900 using trunk because 2950 supports only dot1q, while 1900 supports only ISL.

You could place a switch that supports both encapsulations between 2950 and 1900. For example 2900XL-A/-EN, 3500XL, 3550, 3560, 3750...