Which type of Cisco ASR 5000 service is needed for communication between a Cisco MME and a Serving Gateway?

Question

Options

• AeGTP
• BSGW
• CGTPU
• DPGW

• A
  93% (38)
• B
  2% (1)
• D
  5% (2)

Explanation

eGTP (Enhanced GPRS Tunneling Protocol) is the correct service because the MME and Serving Gateway communicate over the S11 interface, which uses GTPv2-C (GTP version 2, control plane) for session and bearer management signaling - and on the Cisco ASR 5000, the eGTP service implements exactly this GTPv2 control plane functionality.

Why the distractors are wrong:

• B. SGW - The Serving Gateway is an EPC network node (a destination), not a configurable service type on the ASR 5000 that enables MME-SGW communication.
• C. GTPU - GTP-U handles user-plane data tunneling (e.g., encapsulating user traffic), not the control-plane signaling that the S11 interface requires.
• D. PGW - The Packet Data Network Gateway is another EPC node that connects the core to external networks (PDN); it plays no role in the S11 MME-to-SGW interface.

Memory tip: Associate the "e" in eGTP with "evolved" or "enhanced" - it's the LTE-era upgrade to GTP that handles control-plane signaling (GTPv2-C) on key EPC interfaces like S11 (MME↔SGW) and S5/S8 (SGW↔PGW). If the question involves LTE control-plane signaling between core nodes, eGTP is almost always the answer.

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