H3C S9500 Series Operation Manual page 90

Operation Manual – MPLS L3VPN
H3C S9500 Series Routing Switches
Check whether the routing attributes import/export relation of each VPN-instance
is correct.
Check from the hub PE that whether the routing information between two VPN
instances can be learnt by each other. if not, perform the following operation:
check if the EBGP protocol runs between hub PE and hub CE, check whether the
peer peer-address allow-as-loop command is configured between PE and CE.
II. Symptom 2
PE at the local end can learn private network route of the PE at peer end, but two PEs
cannot intercommunicate with each other.
Solution:
Check whether the loopback interface configured on the PE has the address with
32-bit mask.
Check whether the tag of private network route is correct.
Check whether the LDP session is established using the display mpls ldp
session command.
Check whether the LSP tunnel is established using the display mpls lsp
command.
III. Symptom 3
In Hub&Spoke networking mode, spoke PE cannot learn the private networking route of
Hub PE.
Solution:
Check whether the LSP tunnel is established using the display mpls lsp
command.
Check whether the BGP adjacent is established correctly.
Check whether the routing import/export relation of the VPN-instance is correct.
Check whether allow-as-loop is configured between spoke PE and hub PE.
IV. Symptom 4
Fall to specify the Loopback interface at the peer end as the BGP neighbor.
Solution:
Check whether the local routing table has learnt the Loopback interface routing
information of the peer end using the display ip routing-table command.
Check whether the address of the Loopback interface at the peer end can be
pinged using the ping command.
Check whether the configuration information is correct using the display
current-configuration bgp command; confirm that you have specified the local
loopback interface as the interface to create adjacent interface with the peer end
by using the peer peer-address connect-interface command; confirm that you
have activate the neighbor in VPNv4 sub-address family view.
Chapter 1 MPLS L3VPN Configuration
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