Introduction To Multi-Role Host - H3C S9500 Series Operation Manual

Operation Manual – MPLS L3VPN
H3C S9500 Series Routing Switches
OSPF Area0
OSPF 100 VPN
OSPF 200 VPN GREEN
Area1 Area1
VPN-
OSPFArea1
Figure 1-6 OSPF multi-instance application in MPLS L3VPN PE
MPLS
Network
Figure 1-7 Multi-VPN-instance CE application in conventional LAN

1.1.6 Introduction to Multi-Role Host

The VPN attribute of the packets from a CE to its PE lies on the VPN bound with the
ingress interface. This, in fact determines that all the CEs forwarded by the PE through
the same ingress interface belong to the same VPN; but in actual network
environments, a CE may need to access multiple VPNs through one physical interface.
Though you can configure different logical interfaces to meet this need, this
compromised method brings additional configuration burden and has limitation in
actual use.
To resolve this problem, the idea of multi-role host is generated. Specifically to say, this
idea is to differentiate the accesses to different VPNs through configuring policy routing
based on IP addresses, and transmit downstream data flow from PE to CE by
configuring static routing. The static routing under multi-role host circumstance is
VPN-RED
CE11
Site1
0
Area0
- -
RED
- -
GREEN
Site1
CE12
ospf 100 ospf
vpn engineering
- - - - - - - - - - -
PE
vpn vpn
Multi VPN Multi VPN
- -
CE CE
Instance CE
- -
Chapter 1 MPLS L3VPN Configuration
VPN-
GREEN
Site2
OSPFArea2
PE3
MPLS VPN Backbone
PE1 PE2
ospf 200 ospf
ospf 200
vpn vpn
rd rd
- -
ospf 300 ospf
finances
- - - - - - - - - - - -
ospf 300 ospf 300
vpn vpn finances finances
- -
1-10
CE31
Area 2
OSPF 100 VPN - GREEN -
VPN-RED
Site2
OSPF Area1
CE21
Area0
OSPF 100 VPN - RED
OSPF 200 VPN - GREEN -
Area 1
CE22
Engineering
ospf 100 ospf
vpn vpn engineering
- -
Finances
R&D