Refer to the exhibit. Two L3Outs have been created under the same VRF. S1 must communicate only with external IP 128.10.24.32 through R2 and with all other IP addresses through R1. Which subnet must…

The correct answer is A. 128.10.24.32/32 under external EPG of HSS_LAB. Defining 128.10.24.32/32 on the HSS_LAB L3Out’s external-EPG ensures that only that exact host is learned via R2. Defining 0.0.0.0/0 on the CPN_L3 L3Out’s external-EPG catches all other prefixes and sends The ACI fabric uses longest-prefix-match, so the /32 route to R2 takes…

External Network Connectivity

Question

Refer to the exhibit. Two L3Outs have been created under the same VRF. S1 must communicate only with external IP 128.10.24.32 through R2 and with all other IP addresses through R1. Which subnet must be marked as an external subnet for the external EPG to accomplish these goals?

Exhibit

Options

A128.10.24.32/32 under external EPG of HSS_LAB
B128.10.24.32/32 under external EPG of HSS_LAB
C128.0.0.0/2 under external EPG of HSS_LAB
D128.10.24.32/32 under external EPG of HSS_LAB

How the community answered

(23 responses)

A
48% (11)
B
13% (3)
C
30% (7)
D
9% (2)

Explanation

Defining 128.10.24.32/32 on the HSS_LAB L3Out’s external-EPG ensures that only that exact host is learned via R2. Defining 0.0.0.0/0 on the CPN_L3 L3Out’s external-EPG catches all other prefixes and sends The ACI fabric uses longest-prefix-match, so the /32 route to R2 takes precedence for .32 and the default route handles everything else via R1.

Topics

#L3Out#VRF#External EPG#Route leaking#Policy-based routing

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