A network engineer of an ISP using Cisco IOS XR routers wants to limit the number of prefixes that BGP peers can accept. To accomplish this task, the command maximum-prefix 1000 is used. Which two res

Question

Options

• AA warning message displays by default when 750 prefixes are received.
• BA warning message displays by default when 850 prefixes are received.
• CA BGP peer resets when it receives 1001 prefixes.
• DA BGP peer resets when it receives 1000 prefixes.
• EA BGP peer ceases when it receives 1001 prefixes.
• FA BGP peer ceases when it receives 1000 prefixes.
• GThe BGP peer tries to reestablish the session after one minute.

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

Explanation

When 'maximum-prefix 1000' is configured in Cisco IOS-XR, two default behaviors apply. First, a warning message is generated when prefixes reach 75% of the configured limit (75% × 1000 = 750 prefixes), which corresponds to Option A. Option B is incorrect because the default warning threshold is 75%, not 85%. Second, when the number of received prefixes exceeds the configured maximum (i.e., the 1001st prefix arrives), IOS-XR sends a BGP NOTIFICATION message with the 'CEASE' code and brings down the peering session-this is Option E. Options C and D use the term 'reset', which is not the correct IOS-XR behavior; IOS-XR 'ceases' the session rather than performing a hard reset. Option F is incorrect because the session is not ceased at exactly 1000 prefixes-it is ceased when the limit is exceeded (at 1001). Option G is incorrect because by default the session does not automatically reestablish after a fixed time without additional configuration.

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