MPLS VPN与DHCP中继问题

H_Allen

   客户端如何从运营商端的子路由表中获取到DHCP服务器分配的地址（DHCP服务器在运营商端，客户端的PC需从运营商端的子路由表获取到DHCP服务器地址池的地址）。求MPLS VPN和DHCP中继结合使用的资料或者配置命令。求大神解答！

shenka

其实只要客户端CE能够与运营商子路由表通信即可。

配置：
R1:
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.12.1 255.255.255.0
!
interface FastEthernet1/0
ip address 10.0.0.1 255.255.255.0
ip helper-address 44.44.44.44
!
router ospf 1
router-id 1.1.1.1
network 1.1.1.1 0.0.0.0 area 0
network 10.0.0.1 0.0.0.0 area 0
network 192.168.12.1 0.0.0.0 area 0
====================================================
R2:
ip vrf cisco
rd 1:1
route-target export 234:1
route-target import 234:1
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip vrf forwarding cisco
ip address 192.168.12.2 255.255.255.0
!
interface FastEthernet1/0
ip address 192.168.23.2 255.255.255.0
mpls ip
!
router eigrp 1
network 2.2.2.2 0.0.0.0
network 192.168.23.2 0.0.0.0
!
router ospf 1 vrf cisco
router-id 2.2.2.2
redistribute bgp 234 subnets
network 192.168.12.2 0.0.0.0 area 0
!
router bgp 234
no bgp default ipv4-unicast
neighbor 4.4.4.4 remote-as 234
neighbor 4.4.4.4 update-source Loopback0
!
address-family vpnv4
  neighbor 4.4.4.4 activate
  neighbor 4.4.4.4 send-community extended
exit-address-family
!
address-family ipv4 vrf cisco
  redistribute ospf 1 match internal external 1 external 2
exit-address-family
====================================================
R3:
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.34.3 255.255.255.0
mpls ip
!
interface FastEthernet1/0
ip address 192.168.23.3 255.255.255.0
mpls ip
!
router eigrp 1
network 3.3.3.3 0.0.0.0
network 192.168.23.3 0.0.0.0
network 192.168.34.3 0.0.0.0
====================================================
R4:
ip vrf cisco
rd 1:1
route-target export 234:1
route-target import 234:1
!
ip dhcp excluded-address 10.0.0.1 10.0.0.100
!
ip dhcp pool SHENKA
network 10.0.0.0 255.255.255.0
default-router 10.0.0.1
dns-server 10.0.0.1
domain-name shenka.com
lease 0 3
!
interface Loopback0
ip address 4.4.4.4 255.255.255.255
!
interface Loopback1
ip vrf forwarding cisco
ip address 44.44.44.44 255.255.255.255
!
interface Loopback2
ip vrf forwarding cisco
ip address 40.0.0.1 255.255.255.0
ip ospf network point-to-point
!
interface FastEthernet0/0
ip address 192.168.34.4 255.255.255.0
mpls ip
!
router eigrp 1
network 4.4.4.4 0.0.0.0
network 192.168.34.4 0.0.0.0
!
router ospf 1 vrf cisco
router-id 4.4.4.4
redistribute bgp 234 subnets
network 40.0.0.1 0.0.0.0 area 0
network 44.44.44.44 0.0.0.0 area 0
network 192.168.45.4 0.0.0.0 area 0
!
router bgp 234
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 2.2.2.2 remote-as 234
neighbor 2.2.2.2 update-source Loopback0
!
address-family vpnv4
  neighbor 2.2.2.2 activate
  neighbor 2.2.2.2 send-community extended
exit-address-family
!
address-family ipv4 vrf cisco
  redistribute ospf 1 match internal external 1 external 2
exit-address-family

H_Allen

shenka 发表于 2016-7-8 11:26
其实只要客户端CE能够与运营商子路由表通信即可。

配置：

R4ping10.0.0.1通，但是PC获取不到地址？求解！！！R1内网接口上也配了ip helper-address 44.44.44.44。

H_Allen

shenka 发表于 2016-7-8 11:26
其实只要客户端CE能够与运营商子路由表通信即可。

配置：

C:\Users\admin\Desktop

shenka

配置的dhcp是可以正常工作的：

但如果尝试使用路由ip address dhcp获取ip地址就会有问题。看拓扑应该是使用路由的。
在路由上debug dhcp：
*Jul 10 15:22:00.163: DHCP: SRequest- Server ID option: 192.168.34.4
*Jul 10 15:22:00.167: DHCP: SRequest- Requested IP addr option: 10.0.0.155
*Jul 10 15:22:00.167: DHCP: SRequest placed lease len option: 10800
*Jul 10 15:22:00.171: DHCP: SRequest: 309 bytes
*Jul 10 15:22:00.171: DHCP: SRequest: 309 bytes
*Jul 10 15:22:00.175:             B'cast on FastEthernet0/0 interface from 0.0.0.0
R5#%Unknown DHCP problem.. No allocation possible
*Jul 10 15:22:09.759: DHCP: Waiting for 25 seconds on interface FastEthernet0/0

这是cisco IOS的bug：

H_Allen

shenka 发表于 2016-7-10 15:35
配置的dhcp是可以正常工作的：

但如果尝试使用路由ip address dhcp获取ip地址就会有问题。看拓扑应该是 ...

为什么还要创建一个loopback2呢？？
interface Loopback2
ip vrf forwarding cisco
ip address 40.0.0.1 255.255.255.0
ip ospf network point-to-point

H_Allen

shenka 发表于 2016-7-10 15:35
配置的dhcp是可以正常工作的：

但如果尝试使用路由ip address dhcp获取ip地址就会有问题。看拓扑应该是 ...

而且实际环境中，DHCP服务器应该是台PC，怎么可能配置MPLS,BGP等协议呢？

shenka

H_Allen 发表于 2016-7-18 10:29
而且实际环境中，DHCP服务器应该是台PC，怎么可能配置MPLS,BGP等协议呢？

HDCP服务器不需要运行MPLS，当成一台PC接入R4 VRF cisco即可。例中使用R4同时作为DHCP服务器。lo2没有什么特别的意思，可删掉

H_Allen

shenka 发表于 2016-7-18 11:17
HDCP服务器不需要运行MPLS，当成一台PC接入R4 VRF cisco即可。例中使用R4同时作为DHCP服务器。lo2没有什 ...

当成一台PC接入R4的 VRF cisco，指的物理接口绑定VRF cisco吗？但是这样的，一台DHCP服务器只能为一个VRF 绑定接口的主机分配地址了？

shenka

H_Allen 发表于 2016-7-18 11:35
当成一台PC接入R4的 VRF cisco，指的物理接口绑定VRF cisco吗？但是这样的，一台DHCP服务器只能为一个VRF ...

一台DHCP可以为很多VRF服务，灵活设置VRF RT即可

drchzy

其实只要客户端CE能够与运营商子路由表通信即可