Lab Sham-link
Topology:
实验目的：理解Sham-link的使用场景。
说明：默认情况下，R1,R5互通，流量是经过直连链路。通过配置sham-link，R1，R5互通流量经过ISP，R1，R5之间的直连链路为备份链路。（假设R4，R5之间的链路为低带宽）
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
lo 1:11.11.11.11/32
s0/0:12.1.1.1/24
s0/1:15.1.1.1/24
R2:
lo 0:2.2.2.2/32
s0/0:12.1.1.2/24
s0/1:23.1.1.2/24
R3:
lo 0:3.3.3.3/32
lo 1:33.33.33.33/32
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
f1/0:45.1.1.4/24
R5:
lo 0:5.5.5.5/32
s0/1:15.1.1.5/24
f1/0:45.1.1.5/24
Step 2、在R1,R2,R3之间运行isis。
R1:
router isis
net 49.0001.1111.1111.1111.00
int lo 0
ip router isis
int e0/0.23
ip router isis
R2:
router isis
net 49.0001.2222.2222.2222.00
int lo 0
ip router isis
int e0/0.23
ip router isis
int e0/0.34
ip router isis
R3:
router isis
net 49.0001.3333.3333.3333.00
int lo 0
ip router isis
int e0/0.34
ip router isis
Step 3、启用ip cef。
全局模式下：ip cef
Step 4、R1,R2,R3配置MPLS。
ip cef
mpls label range 2000 2999
mpls label protocol ldp
mpls ip router-id Loopback0
int e0/0.23
mpls ip
ip cef
mpls label range 3000 3999
mpls label protocol ldp
mpls ldp router-id lo 0
int e0/0.23
mpls ip
int e0/0.34
mpls ip
ip cef
mpls label range 4000 4999
mpls label protocol ldp
mpls ldp router-id lo 0
int e0/0.34
mpls ip
Step 5、R1,R3配置VRF。
R1:
ip vrf AAA
rd 100:1
route-target both 100:1
interface Loopback1
ip vrf forwarding AAA
ip address 11.11.11.11 255.255.255.255
no clns route-cache
!
interface Serial0/1
ip vrf forwarding AAA
ip address 15.1.1.1 255.255.255.0
serial restart-delay 0
no clns route-cache
!
R3:
!
ip vrf AAA
rd 100:1
route-target export 100:1
route-target import 100:1
interface Loopback1
ip vrf forwarding AAA
ip address 33.33.33.33 255.255.255.255
no clns route-cache
interface Serial0/1
ip vrf forwarding AAA
ip address 34.1.1.3 255.255.255.0
serial restart-delay 0
no clns route-cache
!
Step 6、R1,R3配置MP-BGP。
R1:
router bgp 123
bgp router-id 1.1.1.1
no bgp default ipv4-unicast
bgp log-neighbor-changes
neighbor 3.3.3.3 remote-as 123
neighbor 3.3.3.3 update-source Loopback0
!
address-family vpnv4
neighbor 3.3.3.3 activate
neighbor 3.3.3.3 send-community extended
exit-address-family
!
address-family ipv4 vrf AAA
redistribute connected
redistribute ospf 100
net 11.11 .11.11 mask 255.255.255.255
no auto-summary
no synchronization
exit-address-family
R3:
router bgp 123
bgp router-id 3.3.3.3
no bgp default ipv4-unicast
bgp log-neighbor-changes
neighbor 1.1.1.1 remote-as 123
neighbor 1.1.1.1 update-source Loopback0
!
address-family ipv4
neighbor 1.1.1.1 activate
no auto-summary
no synchronization
exit-address-family
!
address-family vpnv4
neighbor 1.1.1.1 activate
neighbor 1.1.1.1 send-community extended
exit-address-family
!
address-family ipv4 vrf AAA
redistribute connected
redistribute ospf 100
net 33.33.33.33 mask 255.255.255.255
no auto-summary
no synchronization
exit-address-family
Step 7、R4,R5配置ospf 100。
R1:
router ospf 100 vrf AAA
log-adjacency-changes
area 0 sham-link 11.11.11.11 33.33.33.33
redistribute bgp 123 subnets
network 15.1.1.0 0.0.0.255 area 0
R3:
router ospf 100 vrf AAA
log-adjacency-changes
area 0 sham-link 33.33.33.33 11.11.11.11
redistribute bgp 123 subnets
network 34.1.1.0 0.0.0.255 area 0
Step 8、查看的相关命令以及测试结果。
R1#show ip ospf 100 sh
Sham Link OSPF_SL0 to address 33.33.33.33 is up
Area 0 source address 11.11.11.11
Run as demand circuit
DoNotAge LSA allowed. Cost of using 1 State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40,
Hello due in 00:00:05
Adjacency State FULL (Hello suppressed)
Index 2/2, retransmission queue length 0, number of retransmission 1
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum is 0 msec
