帧中继的几个概念
dlci，lmi
3种拓扑：星型，全网络，部分网络；
inverse arp ：dlci与ip等上层协议之间的map关系
设置pvc
首先 设置frame relay类型
接口模式下： encapsulation frame-relay [cisco | ietf]
设置ip地址和带宽（Kbps）
ip address
bandwidth
设置lmi
frame-relay lmi-type [ansi | cisco | q933a](默认cisco)
This command is only needed if using Cisco IOS Release 11.1 or earlier. With IOS Release 11.2 or later, the LMI-type is autosensed and no configuration is needed.
配置静态映射
frame-relay map protocol protocol-address dlci [broadcast]
配置nbma环境下的frame-relay
An NBMA environment is viewed like other multiaccess media environments such as Ethernet, where all the routers are on the same subnet
配置动态映射
frame-relay interface-dlci #
子接口 两种形式