Ospf Vpn Extension - HP 12500 Series Configuration Manual
Mpls, routing switch series
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Also See for 12500 Series:
- Configuration manual (338 pages) ,
- Network management and monitoring command reference (320 pages) ,
- Command reference manual (157 pages)
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SPE-UPE
The MP-BGP running between SPE and UPE can be either MP-iBGP or MP-eBGP. Which one to use
depends on whether the UPE and SPE belong to a same AS.
With MP-iBGP, in order to advertise routes between iBGP peers, the SPE acts as the RR and advertises
routes from iBGP peer UPE to iBGP peer SPE. However, it does not act as the RR of the other PEs.
Recursion and extension of HoVPN
HoVPN supports HoPE recursion:
A HoPE can act as a UPE to form a new HoPE with an SPE.
•
A HoPE can act as an SPE to form a new HoPE with multiple UPEs.
•
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HoVPN supports multi-level recursion.
With recursion of HoPEs, a VPN can be extended infinitely in theory.
Figure 61 Recursion of HoPEs
CE
Figure 61
shows a three-level HoPE. The PE in the middle is called the middle-level PE (MPE). MP-BGP runs
between SPE and MPE, as well as between MPE and UPE.
NOTE:
The term of MPE does not really exist in a HoVPN model. It is used here just for the convenience of
description.
MP-BGP advertises all the VPN routes of the UPEs to the SPEs, and advertises the default routes of the
VPN instance of the SPEs or the VPN routes permitted by the routing policies to the UPEs.
The SPE maintains the VPN routes of all sites in the HoVPN, while each UPE maintains only VPN routes
of its directly connected sites. The number of routes maintained by the MPE is between the previous two.
OSPF VPN extension
NOTE:
This section focuses on the OSPF VPN extension. For more information about OSPF, see
Routing Configuration Guide
SPE
MPE
UPE
UPE
CE
.
UPE
CE
CE
208
Layer 3—IP
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Troubleshooting
