Exam Professional Cloud Network Engineer topic 1 question 161 discussion

C and E follow Google Cloud best practices for active/passive Dedicated Interconnect setup. (C) Advertise a lower MED on the active Interconnect connection from the on-premises router. -Controls ingress traffic (traffic entering Google Cloud). -A lower MED value makes the on-premises routers prefer the active Interconnect. (E) Configure the advertised route priority as 200 for the BGP session associated with the passive Interconnect connection. -Controls egress traffic (traffic leaving Google Cloud). -A lower priority (higher number) for the passive connection ensures it is only used if the active connection fails. Why not (A)? (A) sets a lower priority for the active connection, but best practices recommend setting a lower priority for the passive connection (E) to ensure failover.

to address what is being asked, we need to advertise lower MED for active and passive interconnects. The diagram shows the BGP sessions between on-prem and cloud routers which uses MED. Which is why we need to set the MED values to direct the routing flow. https://cloud.google.com/network-connectivity/docs/router/how-to/configuring-bgp

The default Priority is 100, it doesn't make sense to give a priority of 200 or more than 99 to the active link. 200 should be the priority for the passive link then.

will say C & E the passiv connection needs to have a higher MED number than the active so setting the passiv to 200 means that the active needs to be sat to under 200

A&E Default base priority is 100: https://cloud.google.com/network-connectivity/docs/router/how-to/updating-priority

The base priority is 100. there is no region to region cost. So you want to set the base priority of the passive interconnect to 200 and keep the active one default of 100. the MED will be 100 for active and 200 for passive. A&E are the answers https://cloud.google.com/network-connectivity/docs/router/concepts/overview

Agree, A&C

Advertised router priority is a value sent to Cloud router -> lower mans higher priority. Set the active to prioritt of 200, it gives more priority to the passive (default is 1001). Same per MED -> lower is MED value, more priority you give to that connection. So, if you choose a lower MED value for the active connection, means that you are giving preference to route the traffic to the acrive one rather than the passive.