In Cisco IOS-XR, the maximum-prefix command, to control the number of prefixes that can be installed from a BGP neighbor, is configured under which configuration mode?

Question

Options

• ARP/0/RSP0/CPU0:P2(config-bgp)#
• BRP/0/RSP0/CPU0:P2(config-bgp-af)#
• CRP/0/RSP0/CPU0:P2(config-bgp-nbr)#
• DRP/0/RSP0/CPU0:P2(config-bgp-nbr-af)#

• A
  2% (1)
• B
  7% (3)
• C
  2% (1)
• D
  89% (41)

Explanation

In Cisco IOS-XR, the 'maximum-prefix' command that limits the number of prefixes accepted from a BGP neighbor is configured under the neighbor address-family configuration mode (config-bgp-nbr-af). This is because prefix limits are address-family specific-an IPv4 unicast neighbor may have a different prefix limit than an IPv6 unicast or VPNv4 neighbor relationship with the same peer. The hierarchy is: router bgp (config-bgp) → neighbor (config-bgp-nbr) → address-family (config-bgp-nbr-af), where the maximum-prefix command is placed. Option A (config-bgp) is the top-level BGP configuration mode. Option B (config-bgp-af) is the global address-family mode, not the per-neighbor address-family. Option C (config-bgp-nbr) is the neighbor configuration mode but lacks the address-family context required for this per-AF command.

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