hi every body!
I have few questions:
The context is a switch is connected to cisco ip phone. My book says" If an 802.1q trunk is needed, a special-case trunk automatically is negotiated by dtp and cdp"
1) Can cdp be used to negotiate the trunking?
2) I understand that the cos bits in 802.1q were undefined. 802.1p defines those bits.
My book refers to 802.1q encapsulation with 802.1p bits as 802.1p trunk.
My argument is 802.1p is not trunk encapsulation , it is just the standard that define cos bits in 802.1q. Am i correct?
-------------------------------------------
The command to configure a port connected to ip phone:
switch(config-if)# switchport voice vlan{vlan id/dotip/untagged/none}
The book explains" The default condition for every switch port is none,where a trunk is not used.All modes except for none use the special-case 802.1q trunk"
Here is the assumption is dot1q was negotiated . how about If it were ISL not dot1q?
------------------------------------------
How can i configure switch port,connected to ip phone, use isl trunk ?
Can i do the following:
switch(config-if)# switchport trunk encapsulation isl
switch(config-if)# switchport voice vlan 4
But above command assumes dot1q is in use.
thanks a lot!
