IPSec VPN RRI(Reverse Route Injection)
介绍
RRI(Reverse route injection)是为需要通过IPsec 隧道来加密传输的流量自动创建下一跳指向相应VPN 对端的静态路由。当配置的crypto map是静态crypto map时，RRI是根据crypto map中的ACL所定义的流量来自动创建静态路由。12应用场景
loopback1 +-----+12.1.1.1 +-----+23.1.1.2 +-----+34.1.1.3 +-----+loopback1
-----------| R1 |-------F0/0-------| R2 |-------F0/1-------| R3 |-------F0/0-------| R4 |-----------
10.1.1.1/32+-----+ 12.1.1.2+-----+ 23.1.1.3+-----+ 34.1.1.4+-----+40.1.1.1/32
R1和R2，R3和R4分别建立ospf邻居，当配置完成IPSec VPN，并且在接口下使能之后，RRI会依据配置的“感兴趣的数据流”去产生一条静态路由指向IPSec VPN peer ，产生了静态路由之后，再将静态路由重分发到ospf进程中，这样R1和R4就可以学习到彼此的内网路由，保证了路由层面完整性。
配置命令说明
reverse-route [static | tag tag-id [static] | remote-peer [static] | remote-peer ip-address [static]]
Router (config-crypto-map)# reverse-route
Creates source proxy information for a crypto map entry.
Note The gateway keyword can be added to enable the dual route functionality for default gateway support.
R2(config-crypto-map)#reverse-route static
RRI is added on the static crypto map, which creates routes on the basis of the source network and source netmask that are defined in the crypto access control list (ACL):
In Cisco IOS Release 12.3(14)T and later releases, for the static map to retain this same behavior of creating routes on the basis of crypto ACL content, the static keyword is required, that is, reverse-route static.
Router (config-crypto-map)# set reverse-route distance 20
Specifies a distance metric to be used or a tag value to be associated with these routes.
Router (config-crypto-map)# reverse-route remote peer 10.1.1.1 gateway
Creates source proxy information for a crypto map entry.
配置
R1配置:
!
router ospf 1
!
interface Loopback1
ip address 10.1.1.1 255.255.255.255
ip ospf 1 area 0
!
interface FastEthernet0/0
ip address 12.1.1.1 255.255.255.0
ip ospf 1 area 0
!
R2配置:
!
crypto ikev2 proposal ikev2-proposal
encryption aes-cbc-256
integrity sha512
group 16
!
crypto ikev2 policy ikev2-policy
match fvrf any
proposal ikev2-proposal
!
crypto ikev2 keyring ikev2-keyring
peer ccie43413
address 23.1.1.3
pre-shared-key local ccie43413
pre-shared-key remote ccie43413
!
!
crypto ikev2 profile ikev2-profile
match identity remote address 23.1.1.3 255.255.255.255
authentication remote pre-share
authentication local pre-share
keyring local ikev2-keyring
!
crypto ipsec transform-set ikev2-transform-set esp-aes esp-sha-hmac
mode tunnel
!
crypto map ikev2-map 10 ipsec-isakmp
set peer 23.1.1.3
set transform-set ikev2-transform-set
set ikev2-profile ikev2-profile
match address vpn
reverse-route static
!
ip access-list extended vpn
permit ip 10.1.1.0 0.0.0.255 40.1.1.0 0.0.0.255
!
interface FastEthernet0/0
ip address 12.1.1.2 255.255.255.0
ip ospf 1 area 0
!
interface FastEthernet0/1
ip address 23.1.1.2 255.255.255.0
crypto map ikev2-map
!
router ospf 1
redistribute static subnets
!
R3配置:
!
crypto ikev2 proposal ikev2-proposal
encryption aes-cbc-256
integrity sha512
group 16
!
crypto ikev2 policy ikev2-policy
match fvrf any
proposal ikev2-proposal
!
crypto ikev2 keyring ikev2-keyring
peer ccie43413
address 23.1.1.2
pre-shared-key local ccie43413
pre-shared-key remote ccie43413
!
!
crypto ikev2 profile ikev2-profile
match identity remote address 23.1.1.2 255.255.255.255
authentication remote pre-share
authentication local pre-share
keyring local ikev2-keyring
!
crypto ipsec transform-set ikev2-transform-set esp-aes esp-sha-hmac
mode tunnel
!
crypto map ikev2-map 10 ipsec-isakmp
set peer 23.1.1.2
set transform-set ikev2-transform-set
set ikev2-profile ikev2-profile
match address vpn
reverse-route static
!
ip access-list extended vpn
permit ip host 40.1.1.1 host 10.1.1.1
!
interface FastEthernet0/0
ip address 34.1.1.3 255.255.255.0
ip ospf 1 area 0
!
interface FastEthernet0/1
ip address 23.1.1.3 255.255.255.0
crypto map ikev2-map
!
router ospf 1
redistribute static subnets
!
R4配置:
!
router ospf 1
!
interface Loopback1
ip address 40.1.1.1 255.255.255.255
ip ospf 1 area 0
!
interface FastEthernet0/0
ip address 34.1.1.4 255.255.255.0
ip ospf 1 area 0
!
附录
R2#show crypto route
VPN Routing Table: Shows RRI and VTI created routes
Codes: RRI - Reverse-Route, VTI- Virtual Tunnel Interface
S - Static Map ACLs
Routes created in table GLOBAL DEFAULT
40.1.1.0/255.255.255.0 [1/0] via 23.1.1.3 tag 0 count 1 rtid 5
on FastEthernet0/1 RRI S
R2#show ip rou
R2#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
10.0.0.0/32 is subnetted, 1 subnets
O 10.1.1.1 [110/2] via 12.1.1.1, 06:24:32, FastEthernet0/0
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.1.1.0/24 is directly connected, FastEthernet0/0
L 12.1.1.2/32 is directly connected, FastEthernet0/0
23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 23.1.1.0/24 is directly connected, FastEthernet0/1
L 23.1.1.2/32 is directly connected, FastEthernet0/1
40.0.0.0/24 is subnetted, 1 subnets
S 40.1.1.0 [1/0] via 23.1.1.3
R2#show run | s ip route
R2#
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