Trying to find out in what circumstances, why, would 2 trunk ports 'negotiate' the trunking protocol (ISL or dot1q)? From what I have read, if ISL and 802.1q are both supported, ISL is preferred  - so why negotiate? If only 802.1q is supported then t...

Hi, im trying to work out how my redundancy works - Primary router with WAN cct and failover to Secondary cct with a different WAN cct   We need to failover from primary router to backup router as primary cct needs checks. We need to get the site run...

Can anyone explain how VRRP works with Vlan interfaces? 2 routers, vlans and config duplicated on both routers.   How is VRRP configured and how does it operate when one (or more) vlans go down? How do they fail over to the other router?   Any help a...

Do you need to reload the router when applying new dhcp ip helper-address info? Im worried about a service outage when configuring the new addresses and removing the old ones

Hi, I've been trying to write an idiots guide as to how these interfaces interact with each other to create a DSL connection. Can anyone please sum up what each one does, how they inter-operate in plain english?   anything appreciated