When is a route-policy configuration needed on a Cisco IOS XR router using RPL?
A.
when enabling an IGP routing protocol configuration
B.
when enabling an EBGP peering configuration
C.
when enabling an IBGP peering configuration
D.
when enabling route redistribution
E.
when enabling an LDP peering configuration
Explanation:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.7/routing/configuration/guide/rc37rpl.pdf
http://www.cisco.com/c/en/us/td/docs/routers/xr12000/software/xr12k_r4-1/routing/configuration/guide/routing_cg41xr12k_chapter1.html#con_1197962
Routing Policy Enforcement
External BGP (eBGP) neighbors must have an inbound and outbound policy configured. If no policy is configured, no routes are accepted from the neighbor, nor are any routes advertised to it. This added security measure ensures that routes cannot accidentally be accepted or advertised in the case of a configuration omission error.
Note
This enforcement affects only eBGP neighbors (neighbors in a different autonomous system than this router). For internal BGP (iBGP) neighbors (neighbors in the same autonomous system), all routes are accepted or advertised if there is no policy.
0
0
B.
when enabling an EBGP peering configuration
0
0