Logical Interfaces - Huawei quidway s7700 Configuration Manual

Quidway S7700 Smart Routing Switch
Configuration Guide - Basic Configuration
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Physical interfaces are located on the main control board and LPUs of the S7700.

Logical Interfaces

Logical interfaces do not exist and are set up by configurations.
The S7700 supports the following logical interfaces:
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Issue 01 (2011-07-15)
10 Gigabit Ethernet interface
Eth-Trunk
The Eth-Trunk consists of Ethernet links only.
The Eth-Trunk technique has the following advantages:
– Increased bandwidth: The bandwidth of an Eth-Trunk is the total bandwidth of all
member interfaces.
– Improved reliability: When a link fails, traffic is automatically switched to other
available links. This ensures link reliability.
For details about the Eth-Trunk configuration, see "Configuring the Eth-Trunk" in the
Quidway S7700 Smart Routing Switch Configuration Guide - Ethernet.
Loopback interface
A loopback interface is a virtual interface. The TCP/IP protocol suite defines IP address
127.0.0.0 as a loopback address. When the system starts, it automatically creates an
interface using the loopback address 127.0.0.1 to receive all data packets sent to the local
device.
Some applications such as mutual access between virtual private networks need a local
interface with a specified IP address without affecting the configuration of physical
interfaces. This IP address has a 32-bit mask (to save IP addresses) and can be advertised
by routing protocols.
The status of a loopback interface is always Up; therefore, the IP address of the loopback
interface can be used as the router ID, the label switching router (LSR) ID, or be land to a
tunnel.
For details, see 3.3 Configuring the Loopback
Null interface
Null interfaces are similar to null devices supported by certain operating systems. Any data
packets sent to a null interface are discarded. Null interfaces are used for route selection
and policy-based routing (PBR). For example, if a packet matches no route during route
selection, the packet is sent to the null interface.
Tunnel interface
A tunnel interface can be used as the backup interface of other interfaces and used to set
up Generic Routing Encapsulation (GRE) tunnels or Multiprotocol Label Switching
(MPLS) Traffic Engineering (TE) tunnels.
For details about the configuration, see "Configuring the Tunnel Interface" in the Quidway
S7700 Smart Routing Switch Configuration Guide - IP Service.
MTunnel interface
An MTunnel interface (MTI) is the ingress or egress of a multicast tunnel (MT). The local
provider edge (PE) sends data of the private network through the MTI, and the remote PE
receives data of the private network through MTI.
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