300-620 · Question #110
A customer creates Layer 3 connectivity to the outside network. However, only border leaf switches start receiving destination updates to other networks from the newly created L3Out. The updates must
The correct answer is A. Apply a BGP route reflector policy.. When border leaf switches learn external routes via an L3Out but fail to propagate them to other ACI leaf switches, configuring a BGP route reflector policy on the spine switches is necessary to distribute these routes internally via iBGP.
Question
A customer creates Layer 3 connectivity to the outside network. However, only border leaf switches start receiving destination updates to other networks from the newly created L3Out. The updates must also be propagated to other Cisco ACI leaf switches. The L3Out is linked with the EPGs via a contract. Which action must be taken in the pod policy group to accomplish this goal?
Options
- AApply a BGP route reflector policy.
- BEnable a COOP policy.
- CConfigure an IS-IS policy.
- DImplement an access management policy.
How the community answered
(30 responses)- A77% (23)
- B3% (1)
- C7% (2)
- D13% (4)
Why each option
When border leaf switches learn external routes via an L3Out but fail to propagate them to other ACI leaf switches, configuring a BGP route reflector policy on the spine switches is necessary to distribute these routes internally via iBGP.
In Cisco ACI, border leaf switches learn external routes from an L3Out, but to propagate these routes to all other leaf switches in the fabric, spine switches must be configured as BGP route reflectors. Applying a BGP route reflector policy ensures that external routes are distributed internally via iBGP to all leaf switches that are BGP clients.
COOP (Council Of Oracle Protocol) is primarily used for endpoint learning and consistency within the ACI fabric, not for the distribution of external routing updates to leaf switches.
IS-IS is the underlay routing protocol used in the ACI fabric for reachability between spine and leaf TEPs, but it does not propagate external routing updates to leaf switches.
An access management policy is related to user authentication, authorization, and accounting, and it has no role in the propagation of routing information within the ACI fabric.
Concept tested: Cisco ACI external route propagation via BGP route reflectors
Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/3-x/routing/b_Cisco_ACI_BGP_Route_Reflector_Deployment_Guide_3_0_1.html
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