Configuring Ccc Vll; Establishing The Configuration Task - Huawei quidway s7700 Configuration Manual

Smart routing switch

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Quidway S7700 Smart Routing Switch

Configuration Guide - VPN

The VLL in Martini mode supports graceful restart (GR). In this manner, after the device

performs the switchover, the VC labels remain unchanged. During the switchover, the VC keeps

Up. The packet forwarding on the VC is not affected by the switchover.

5.3 Configuring CCC VLL

This section describes how to configure a CCC VLL. The CCC VLL transmits data by adding

a one-layer label to the data. Being configured by the administrator, the CCC VLL is applicable

to an MPLS network of the small size and simple topology. The CCC VLL needs no signaling

negotiation and control packet exchange, and thus consumes fewer resources and is easy to

understand. Nevertheless, the CCC VLL has poor scalability and is inconvenient to maintain.

Applicable Environment

CCC is applicable to the small-sized MPLS networks that has simple topology. CCC needs to

be configured manually. CCC does not need signaling negotiation or packet interaction. The

resource consumption is low and the configuration is simple. However, CCC is not easy to be

maintained and the extensibility is poor.

You need to configure interface connecting the PE to the CE (namely the AC interface) before

configuring a CCC.

Issue 01 (2011-07-15)

Asymmetrically connected CEs

One CE is connected to a PE through an AC and the other CE is dual-homed to PEs through

two ACs, as shown in

Figure 5-3 Asymmetrically connected CEs

On an S7700, only the VLANIF interface can be configured as the AC interface of CCC connection.

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VPN backbone

5 VLL Configuration