Huawei SSN1EGSH EoS service board, apply to OSN 7500


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SSN1EGSH overview

The EGSH is used to transmit/receive Ethernet services, manage bandwidths, and realize Layer 2 switching of Ethernet services.

Valid Slots

The EGSH must be installed in a valid slot in the subrack. Otherwise, the EGSH fails to work normally.

The EGSH can be installed in slots 2-8 and 11-17, the bandwidth is 10 Gbit/s.

Feature Code

The number code that follows the board name in the bar code is the feature code of the board. The feature code of the EGSH indicates the type of optical interface.

Relationship between the feature code of the EGSH and the type of optical interface

Feature Code
Type of Optical Interface
SSN1EGSH10 10 1000BASE-SX (0.5 km)
SSN1EGSH11 11 1000BASE-LX (10 km)a
a: The G.657A2 fiber jumper is required because the single-mode optical module is used over the interface.
Specifications of the ports
Port type
1000BASE-LX 10 km GE two-fiber bidrectional optical interfaces
1000BASE-SX 0.5 km GE two-fiber bidrectional optical interfaces


The board processes 16xGE services. It provides functions such as O/E conversion, Ethernet frame processing, mapping, Layer 2 (L2) switching signals. The board is connected to the active and standby cross-connect boards through the backplane. In this manner, data is exchanged and services are scheduled.
Interface types
  • Supports the 1000BASE-SX and 1000BASE-LX optical interfaces.
  • All the sixteen interfaces comply with IEEE 802.3z.
Functions when being used with an interface board Transmits/Receives 16 channels of Ethernet signals through the interfaces on the front panel.
Interface characteristics Working modes Auto-negotiation, 1000M full-duplex
Traffic control mode at ports Auto-negotiation mode Supported.
Non-autonegotiation mode Supported.
Query/Setting of port status Supported.
Query of interface types Supported.
Setting of optical power thresholds Not supported.
Pluggable optical module SFP optical modules
Service categories EPL service Supports the PORT-based transparent transmission.
EVPL service
  • Supports EVPL services based on QinQ.
  • Supports the EVPL services that are based on PORT+VLAN.
EPLAN service
  • Supports the L2 convergence and point-to-multipoint (P2MP) convergence.
  • Supports the L2 forwarding function.
  • Supports a maximum of 512 blacklist entries and 512 static MAC addresses.
  • Supports the self-learning of the source MAC address. The MAC address table is 32k in size. The aging time of the MAC address can be set and queried.
  • Supports the configuration of the static MAC route.
  • Supports the query of the dynamic MAC address.
  • Supports the creation, deletion, and query of the VB. Only one VB is supported. The maximum number of logical ports for one VB is 40.
  • Supports the data isolation based on VB+VLAN.
  • Queries the number of actually learned MAC addresses based on VB+VLAN or VB+LP.
  • Supports the EPLAN services that are based on the IEEE 802.1d MAC bridge.
EVPLAN service
  • Supports EVPLAN services that use stack VLAN encapsulation.
  • Supports data isolation based on VB+VLAN.
  • Supports the creation, deletion, and query of the VB. Only one VB is supported. The maximum number of logical ports for one VB is 40.
  • Supports EVPLAN services based on IEEE 802.1q virtual bridges and IEEE 802.1ad provider bridges.
Service specifications Formats of Ethernet data frames IEEE 802.3 Supported.
Ethernet II Supported.
IEEE 802.1 q TAG Supported.
Frame length range The 16 physical ports support a packet length ranging from 1518 bytes to 9600 bytes and a jumbo frame with a maximum length of 9600 bytes. The jumbo frame length supported by the 24 VCTRUNKs is as follows:

  • VCTRUNKs 1-4 support a jumbo frame with a maximum length of 9600 bytes.
  • VCTRUNKs 5-24 support a jumbo frame with a maximum length of 1522 bytes.
Mapping granularities Supports VC-4, VC-3, VC-4-Xv (X≤8), and VC-3-Xv (X≤24) granularities.
Encapsulation formats HDLC Not supported.
LAPS Not supported.
GFP-F Supported.
MPLS technology Not supported.
VLAN technology Supports a total number of 4094 VLANs, which comply with IEEE 802.1q/p.
Maximum uplink bandwidth The maximum uplink bandwidth of the EGSH is 10 Gbit/s.
Maximum bound bandwidth 64 x VC-4, or 192 x VC-3
VCTRUNK specifications

Number of supported VCTRUNKs: 24

Configuration principles are as follows:

  • Each VC channel can be bound only to one VCTRUNK.
  • One VCTRUNK can be bound with a maximum of eight VC-4s or 24 VC-3s.
  • A single VCTRUNK supports a maximum bandwidth of 1 Gbit/s.
Protection schemes TPS Not supported.
BPS Not supported.
PPS Not supported.
DLAG Supported.
LAG Supports manual link aggregation and static link aggregation.

Supports the load sharing mode and load non-sharing mode.

Complies with IEEE 802.3ad and IEEE 802.1AX.

LCAS Supports LCAS, which dynamically increases or decreases the bandwidth and protects the bandwidth in compliance with ITU-T G.7042.
  • Supports the point-to-point (P2P) LPT and point-to-multipoint (P2MP) LPT.
  • Complies with Huawei proprietary protocol.
STP/RSTP Supports the broadcast packet suppression function and rapid spanning tree protocol (RSTP) that comply with IEEE 802.1w.
MSTP Supported.
Clock synchronization Synchronous Ethernet Not supported.
IEEE 1588v2 Not supported.
Interconnection requirement If the clocks are not synchronized between the source and sink NEs on the network, the service latency on the N1EGSH board may increase unexpectedly, which may affect performance and user experience of latency-sensitive services.
Maintenance features ETH OAM
  • Supports CC, LB tests, and LT tests in compliance with IEEE 802.1ag, and OAM ping in compliance with Huawei proprietary protocol.
  • Supports OAM auto-discovery, remote loopbacks, fault detection, and link performance detection in compliance with IEEE 802.3ah, and selfloop detection in compliance with Huawei proprietary protocol.
Test frame Supports test frames in GFP or Ethernet bearer mode.
Response to ping Not supported.
Port Mirroring Supports only ingress mirroring.
Loopback capability PHY layer at Ethernet ports Supports inloops.
MAC layer at Ethernet ports Supports inloops.
VC-4 level Not supported.
VC-3 level Not supported.
VC-12 level Not supported.
Ethernet performance monitoring (RMON) Supports RMON of the Ethernet performance of Ethernet ports and VCTRUNKs.
Warm resets Supported (Warm resets do not affect services.)
Cold resets Supported
Alarms and performance events Reports various alarms and performance events, which facilitates the management and maintenance of the equipment.
  • Supports CAR. The service granularity is 64 kbit/s.
  • Supports eight classes of service (CoS) function, which complies with IEEE 802.1p.
  • Supports the flow classification based on PORT, PORT+CVLAN, PORT+SVLAN, PORT+VLAN+VLAN PRI, and PORT+CVLAN+SVLAN.
  • Supports shaping based on ports or queues.
IGMP Snooping Protocol enabling Supported
Port aging time Supported
Fast leave Not supported
Discarding of unknown broadcast packets Not supported
Static broadcast entry Supported
Hub/Spoke Supported
Traffic control Supports the port-based traffic control function that complies with IEEE 802.3x.


Only EPL services support port-based traffic control.


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