Classical Internet Access,,using subinterface,,,using static-routing
拓扑说明：
1.R2、R3为ISP网络，MPLS VPN
3.R2为PE
4.R3与R4为IPV4单播邻居。R4的loopback0:4.4.4.4/32代表所有的Internet路由。
5.R1为CE，MPLSVPN客户。R1与R2之间有两条物理线路(或者一条物理线路，使用可以起子接口的WAN封装，比如FR)
实验要求： 使用典型的Internet访问(静态路由)的方法，使用R1访问Internet时，走线路1。R1访问其它VPN客户时，走线路2.要求最优配置。
Step 1.配置各台路由器的IP地址，并且使用Ping命令确认各路由器的直连口的互通性。
| R1: lo 0:1.1.1.1/32 s0/0:12.1.1.1/24 s0/1:21.1.1.1/24 R2: lo 0:2.2.2.2/32 s0/0:12.1.1.2/24 s0/2:21.1.1.2/24 s0/1:23.1.1.2/24 R3: lo 0:3.3.3.3/32 s0/0:23.1.1.3/24 s0/1:34.1.1.3/24 R4: lo 0:4.4.4.4/32 s0/0:34.1.1.4/24 |
step 2.isp内部配置igp,isis.
| R2: router isis net 49.0001.2222.2222.2222.00 int s0/1 ip router isis int lo 0 ip router isis |
| R3: router isis net 49.0001.3333.3333.3333.00 int s0/0 ip router isis int lo 0 ip router isis |
step 3.mpls
| R2: mpls label range 2000 2999 mpls label protocol ldp mpls ldp router-id lo 0 ip cef int s0/1 mpls ip |
| R3: mpls label range 3000 3999 mpls label protocol ldp mpls ldp router-id lo 0 ip cef int s0/0 mpls ip |
step 4.vrf
| R2: ip vrf vpna rd 100:1 route-target both 100:1 int s0/0 ip vrf forwarding vpna ip add 12.1.1.2 255.255.255.0 |
| R3: ip vrf vpna rd 100:1 route-target both 100:1 |
step 5.mp-bgp,static route,announce static route.
| R2: ip route 1.1.1.1 255.255.255.255 21.1.1.1 router bgp 23 no au no sy bgp router-id 2.2.2.2 no bgp default ipv4-unicast nei 3.3.3.3 remote-as 23 nei 3.3.3.3 update-source lo 0 address-family vpnv4 nei 3.3.3.3 activate exit address-family ipv4 no au no sy nei 3.3.3.3 activate nei 3.3.3.3 next-hop-self net 1.1.1.1 mask 255.255.255.255 exit |
| R3: router bgp 23 no au no sy bgp router-id 3.3.3.3 no bgp default ipv4-unicast nei 2.2.2.2 remote-as 23 nei 2.2.2.2 update-source lo 0 address-family vpnv4 nei 2.2.2.2 activate exit address-family ipv4 no au no sy nei 2.2.2.2 activate nei 2.2.2.2 next-hop-self nei 34.1.1.4 remote-as 4 exit |
| R4: router bgp 4 no au no sy bgp router-id 4.4.4.4 nei 34.1.1.3 remote-as 23 net 4.4.4.4 mask 255.255.255.255 |
step 6.ce,igp,重分发到vrf.
| R1: router rip ver 2 no au net 1.1.1.1 net 12.0.0.0 |
| R2: router rip ver 2 no au address-family ipv4 vrf vpna ver 2 no au net 12.0.0.0 red bgp 23 metric 5 exit router bgp 23 address-family ipv4 vrf vpna red rip |
step 7.ce configure default route.
| R1: ip route 0.0.0.0 0.0.0.0 s0/1 |
step 8.traceroute 观察路径。
| R1#traceroute Protocol [ip]: Target IP address: 4.4.4.4 Source address: 1.1.1.1 Numeric display [n]: Timeout in seconds [3]: Probe count [3]: Minimum Time to Live [1]: Maximum Time to Live [30]: Port Number [33434]: Loose, Strict, Record, Timestamp, Verbose[none]: Type escape sequence to abort. Tracing the route to 4.4.4.4 1 21.1.1.2 20 msec 68 msec 12 msec 2 23.1.1.3 48 msec 28 msec 60 msec 3 34.1.1.4 64 msec * 36 msec |