Angela_Zou
01-25-2010, 08:40 AM
Hi,
I'm currently taking CCNA courses but was recently stuck with STP. To be exact, I'm not stuck with what it does, just some protocols related to it.
So far, I understand that RSTP is much faster than STP. PVST+ is composed of PortFast, BackboneFast, and UplinkFast. But then, I was stuck by the relationship between RSTP, PVST+, and PVRST+. The review book I'm using (CCNA Exam Cram) tells me that "A Cisco Catalyst switch running PVST+ or PVRST+ maintains an instance of spanning tree for each active VLAN that is configured on the switch.", which I currently have no idea what it means. Please guide me out of this mess, thanks.
Also, the Trunking part is kind of ambiguous, so to speak. What exactly is a trunk? is it just a protocol (that would be 802.1Q or ISL, right?) or hardware (cross-over cable?)?
I'm currently taking CCNA courses but was recently stuck with STP. To be exact, I'm not stuck with what it does, just some protocols related to it.
So far, I understand that RSTP is much faster than STP. PVST+ is composed of PortFast, BackboneFast, and UplinkFast. But then, I was stuck by the relationship between RSTP, PVST+, and PVRST+. The review book I'm using (CCNA Exam Cram) tells me that "A Cisco Catalyst switch running PVST+ or PVRST+ maintains an instance of spanning tree for each active VLAN that is configured on the switch.", which I currently have no idea what it means. Please guide me out of this mess, thanks.
Also, the Trunking part is kind of ambiguous, so to speak. What exactly is a trunk? is it just a protocol (that would be 802.1Q or ISL, right?) or hardware (cross-over cable?)?