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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R012C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, HVRP, and Layer 2 protocol transparent transmission.
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Basic Concepts of VCMP

Basic Concepts of VCMP

VCMP uses a VCMP domain to manage switches and determine attributes of switches in the VCMP domain based on roles. VCMP defines four roles: server, client, transparent, and silent. Figure 13-1 shows VCMP domains and roles in the VCMP domains.

Figure 13-1  VCMP domains and roles

VCMP Domain

As shown in Figure 13-1, a VCMP domain is composed of switches that have the same VCMP domain name and are connected through trunk or hybrid interfaces. All switches in the VCMP domain must use the same domain name, and each switch can join only one VCMP domain. Switches in different VCMP domains cannot synchronize VLAN information.

A VCMP domain specifies the scope for the administrative switch and managed switches. Switches in a VCMP domain are managed by the administrative switch. There is only one administrative switch and multiple managed switches in a VCMP domain.

VCMP Roles

VCMP determines attributes of switches based on VCMP roles. Table 13-1 describes VCMP roles.

Table 13-1  VCMP roles

VCMP Role

Function

Remarks

Server

The VCMP server synchronizes VLAN information to other switches in the local VCMP domain.

VLAN information created and deleted on the VCMP server is broadcast in a VCMP domain.

Client

A VCMP client belongs to a specified VCMP domain and synchronizes VLAN information with the VCMP server.

VLAN information created and deleted on a VCMP client is not broadcast in a VCMP domain, but is overwritten by VLAN information sent by the VCMP server.

Transparent

A VCMP transparent switch does not affect other switches in the local VCMP domain and is not affected by VCMP management behaviors such as VLAN creation and deletion.

A VCMP transparent switch transparently forwards VCMP packets to only trunk or hybrid links.

VLAN information created and deleted on a VCMP transparent switch is not affected by the VCMP server and is not broadcast in a VCMP domain.

In this way, some switches that do not need to be managed by VCMP can forward VCMP packets.

Silent

Deployed at the edge of a VCMP domain, a VCMP silent switch does not affect other switches in the local VCMP domain and is not affected by VCMP management behaviors. The VCMP silent switch prevents VCMP packets in a VCMP domain from being transmitted to other VCMP domains.

A VCMP silent switch directly discards received VCMP packets.

VLAN information created and deleted on a VCMP silent switch is not affected by the VCMP server and is not broadcast in a VCMP domain.

NOTE:
  • VCMP transparent and silent switches do not belong to any VCMP domain.
  • If an edge switch in a VCMP domain needs to be managed, configure the edge switch as a VCMP client. To prevent VCMP packets in the local VCMP domain from being transmitted to other VCMP domains, disable VCMP on the edge switch interface connected to other VCMP domains.

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Updated: 2019-01-18

Document ID: EDOC1100038843

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