BGP is configured on two peers, routers A and B. Router A is configured with a Hold Time timer of 60 seconds and a Keepalive timer of 25 seconds. Router B is configured with a Hold Time timer of 90…

Question

Options

• A70 seconds
• B25 seconds
• C20 seconds
• D30 seconds

• A
  6% (1)
• B
  6% (1)
• C
  72% (13)
• D
  17% (3)

Explanation

BGP negotiates the Hold Time by selecting the lower of the two peers' configured values. Router A's 60-second Hold Time is lower than Router B's 90-second Hold Time, so 60 seconds becomes the active Hold Time for both peers. The active Keepalive timer is always 1/3 of the negotiated Hold Time (60 ÷ 3 = 20 seconds), regardless of what either router had locally configured - making C correct.

Why the distractors fail:

• A (70s): Router B's locally configured Keepalive, which is overridden once Hold Time is renegotiated downward.
• B (25s): Router A's locally configured Keepalive - BGP doesn't adopt the peer's Keepalive value directly.
• D (30s): 1/3 of Router B's original Hold Time (90 ÷ 3), but since the negotiated Hold Time is 60 (not 90), this calculation uses the wrong base.

Memory tip: "Lowest Hold Time wins the negotiation, then divide by 3 to get Keepalive." Both routers end up using the same derived Keepalive, regardless of what they started with.

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