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SGW-C — Serving Gateway (Control Plane)

The SGW-C is the control-plane half of the EPC Serving Gateway. It anchors each subscriber's bearers between the access network and the packet gateway: it terminates S11 to the MME (session and bearer signalling), S5/S8 to the PGW‑C (the PDN connection), and programmes the user plane (SGW‑U) that forwards traffic on S1‑U to the eNodeB. In short, it is the node that holds the live bearer state for every attached subscriber and keeps the MME, PGW and user plane in step. OmniWeb surfaces the SGW‑C's live sessions, session counts and logs; longer‑run trends (throughput, session growth) are on the Grafana dashboards reached from the same page.

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The SGW‑C is a per‑instance element page reached from the sidebar when one runs in the site's inventory, and — where several are deployed — a fleet view for aggregate status. All traffic goes through the OmniWeb backend proxy to the SGW‑C's API, so it stays behind the single authenticated gateway. The documentation link in the page header (the in‑context help button) opens this page. It is organised into tabs.

Overview​

The SGW-C overview — API health, active session count, and a summary of unique MME and PGW peers and total bearers

A single‑screen health read: the API status of the SGW‑C, the active session count, and a summary derived from the live sessions — the number of unique MMEs (distinct S11 peers), unique PGWs (distinct S5/S8 peers), and the total bearers currently anchored. It is the quickest way to confirm the SGW‑C is up, how many sessions it holds, and how many MMEs and PGWs it is working with.

Sessions​

The SGW-C sessions tab listing anchored sessions by IMSI/MSISDN with their S11 and S5/S8 control-plane endpoints, PDN connections and bearers

Every anchored session, each row keyed by subscriber IMSI and MSISDN with its connection status. Opening a session shows its full bearer state: the S11 control endpoints (MME‑side and SGW‑side F‑TEIDs), each PDN connection (APN, default bearer, and the S5/S8 control F‑TEIDs to the PGW), and each bearer (EBI, the S1‑U and S5/S8 user‑plane F‑TEIDs, and its QoS). This is where you confirm a specific subscriber's bearers are established and see which MME and PGW are serving them.

Logs​

The Logs tab tails the SGW‑C's live log output for troubleshooting a single gateway without leaving OmniWeb.

Monitoring dashboards​

Throughput, session‑count trends and other time‑series for the SGW‑C are presented as Grafana dashboards, reached from the element page — OmniWeb does not duplicate those charts natively.

  • MME — the control peer over S11; it drives session and bearer setup on the SGW‑C.
  • The PGW‑C anchors the PDN connection over S5/S8.
  • The SGW‑U / UPF is the user plane the SGW‑C programmes to forward traffic on S1‑U.
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