l 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.
Figure 5-3 Asymmetrically connected CEs
CE1
CE2
PE1
PE3
PE2
P2
P1
VPN backbone
Site1
Site2
AC1
AC2
AC3
GR
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.
5.3.1 Establishing the Configuration Task
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.
NOTE
On an S7700, only the VLANIF interface can be configured as the AC interface of CCC connection.
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 5 VLL Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
454
To Next Page
Loading...
