Which uplink configuration combination of the Top of the Rack Switch and the MX7000 Management Module is supported?

Question

Options

• A100 Mbps (Auto negotiation OFF) and Auto negotiation OFF
• B100 Mbps (Auto negotiation ON) and Auto negotiation OFF
• C100 Mbps (Auto negotiation OFF) and Auto negotiation ON

• A
  91% (61)
• B
  3% (2)
• C
  6% (4)

Explanation

Option A is correct because both the ToR Switch and the MX7000 Management Module have auto-negotiation disabled, meaning both sides are manually hardcoded to the same fixed speed and duplex settings - a consistent, stable configuration.

Why B is wrong: Having auto-negotiation ON on the ToR side while it's OFF on the MX7000 creates a mismatch. The ToR attempts to negotiate parameters, but the MX7000 won't respond to negotiation signals. This typically causes a duplex mismatch (e.g., one side locks to full-duplex, the other defaults to half-duplex), leading to degraded or failed connectivity.

Why C is wrong: It's the mirror image of B - the mismatch problem is the same, just reversed. The MX7000 tries to auto-negotiate while the ToR is hardcoded, producing the same incompatibility.

Memory tip: Think of auto-negotiation like a handshake - both hands must match. If one person extends a hand (auto-neg ON) and the other keeps theirs at their side (auto-neg OFF), the handshake fails. Both OFF (A) works because both sides agree to skip the handshake and just follow the same fixed rules.

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