Case Study: Policy Routing and Quality of Service Routing
Policy Routing结合ip包头的Precedence和Type of Service(TOS)可以实现基于QOS的策略路由。
注:Precedence和TOS的配置既可使用Number字段,也可以使用Keyword.
set ip precedence-------------------------------------Bits Number Keyword000 0 routine001 1 priority010 2 immediate011 3 flash100 4 flash-override101 5 critical110 6 internet111 7 network-------------------------------------set ip tos-------------------------------------Bits Number Keyword0000 0 normal0001 1 min-monetary-cost0010 2 max-reliability0100 4 max-throughput1000 8 min-delay-------------------------------------interface Serial0 ip address 10.1.18.67 255.255.255.252 ip policy route-map sense!interface Serial1 ip address 10.34.16.83.255.255.255.252 ip policy route-map sense!access-list 1 permit 172.16.0.0 0.0.255.255access-list 110 permit tcp any eq www any!route-map sense permit 10 match ip address 1 110 set ip precedence critical!route-map sense permit 20 set ip tos 10 set ip precedence priorityCase Study: Route Tagging |
用途:
用于双向重分布时标识特定Domain的路由,以防路由被重分布回起源Domain.
使用方案:
通告路由条目的边缘Router在重分布时给路由条目加上Tag标识,做为Transit Network的Domain,不需要使用和识别Tag,仅仅需要将它传递到它的外部网络即可。