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Troubleshooting flowchart
Figure 15 Troubleshooting ECMP forwarding failure
Solution
To resolve the issue:
1.
Verify that the device has routes to the destination network:
a.
Execute the
display bgp l2vpn evpn route-distinguisher route-type ip-prefix
command.
b.
Verify that the device has routes to the destination network.
The routes must have the same RD and different next hops. If only one route exists, ECMP
forwarding cannot be performed.
2.
Verify that the routes have the same community attributes and extended community attributes:
Only one route to the destination
network?
No
Yes
No ECMP routes exist
End
No
Yes
ECMP forwarding failure
Route community attributes and
extended community attributes
not match?
Configure the same
attributes for the
routes
Any non-BGP routes?
No
Raise the priority of
BGP routes
Yes
Number of BGP
ECMP routes set?
Yes
Use
balance
to set
the number of BGP
ECMP routes to a
value larger than 1
No
No
No
No
Yes
Yes
Yes
Problem resolved?
Problem resolved?
Problem resolved?
Contact the support
Do routes carry the default-
gateway attribute?
No
Delete the default-
gateway attribute
Yes
No
Yes
Problem resolved?
