OSPF & merge external on

[Mikhail Mayorov]

Hello!

I would like use ECMP for 0.0.0.0/0. This route announced on 
10.10.97.33, 10.10.97.72, 10.10.97.73 as LSA5. Below I have given the 
output of the command on the router 10.10.97.67.
I expected to see a default route through 2 interfaces C3 to D1, but 
next hops not merge.
Maybe I misunderstand the work "merge external on". I expected that the 
bird would combine routes from different routers for the same 
destination although OSPF.metric1 or OSPF.metric2.

bird>show route for10.10.97.73 table igpcoret4 all
Table igpcoret4:
10.10.97.73/32unicast [igpcore4 20:05:45]*E2 (150/310/10000)[10.10.97.73]
via 10.112.0.14 on C3 weight 40
via 10.112.0.28 on D1 weight 40
Type:OSPF-E2 univ
OSPF.metric1:310
OSPF.metric2:10000
OSPF.tag:0x00000000
OSPF.router_id:10.10.97.73
bird>show route for10.10.97.72 table igpcoret4 all
Table igpcoret4:
10.10.97.72/32unicast [igpcore4 20:05:45]*E2 (150/2300/10000)[10.10.97.72]
via 10.112.0.14 on C3
Type:OSPF-E2 univ
OSPF.metric1:2300
OSPF.metric2:10000
OSPF.tag:0x00000000
OSPF.router_id:10.10.97.72
bird>show route for10.10.97.33 table igpcoret4 all
Table igpcoret4:
10.10.97.33/32unicast [igpcore4 20:05:45]*E2 (150/300/10000)[10.10.97.33]
via 10.112.0.14 on C3
Type:OSPF-E2 univ
OSPF.metric1:300
OSPF.metric2:10000
OSPF.tag:0x00000000
OSPF.router_id:10.10.97.33
bird>show route for0.0.0.0/24table igpcoret4 all
Table igpcoret4:
0.0.0.0/0unicast [igpcore4 20:05:45]*E2 (150/300/10000)[10.10.97.33]
via 10.112.0.14 on C3
Type:OSPF-E2 univ
OSPF.metric1:300
OSPF.metric2:10000
OSPF.tag:0x00000000
OSPF.router_id:10.10.97.33
bird>
>showospf state all igpcore4
area 0.0.0.0
router 10.10.97.33
distance 300
router 10.10.97.72metric 2000
router 10.10.97.72metric 2000
router 10.10.97.72metric 2000
router 10.10.97.72metric 2000
router 10.10.97.73metric 10
router 10.10.97.67metric 300
router 10.10.97.66metric 300
router 10.10.97.68metric 65535
stubnet 10.112.0.0/31metric 2000
stubnet 10.112.0.2/31metric 2000
stubnet 10.112.0.4/31metric 2000
stubnet 10.112.0.6/31metric 2000
stubnet 10.112.0.12/31metric 10
stubnet 10.112.0.14/31metric 300
stubnet 10.112.0.18/31metric 300
stubnet 10.112.0.22/31metric 65535
external 0.0.0.0/0metric2 10000
external 10.112.0.0/31metric2 10000
external 10.112.0.2/31metric2 10000
external 10.112.0.4/31metric2 10000
external 10.112.0.6/31metric2 10000
external 10.112.0.12/31metric2 10000
external 10.112.0.14/31metric2 10000
external 10.112.0.18/31metric2 10000
external 10.112.0.22/31metric2 10000
external 87.245.238.204/31metric2 10000
external 10.10.8.0/21metric2 10000
external 10.10.97.33/32metric2 10000
router 10.10.97.66
distance 10
router 10.10.97.73metric 300
router 10.10.97.33metric 300
router 10.10.97.69metric 65535
router 10.10.97.67metric 10
stubnet 10.112.0.16/31metric 300
stubnet 10.112.0.18/31metric 300
stubnet 10.112.0.24/31metric 65535
stubnet 10.112.0.28/31metric 10
external 10.112.0.16/31metric2 10000
external 10.112.0.18/31metric2 10000
external 10.112.0.24/31metric2 10000
external 10.112.0.28/31metric2 10000
external 10.10.0.0/21metric2 10000
external 10.10.97.66/32metric2 10000
router 10.10.97.67
distance 0
router 10.10.97.33metric 300
router 10.10.97.66metric 10
router 10.10.97.69metric 65535
stubnet 10.112.0.14/31metric 300
stubnet 10.112.0.28/31metric 10
stubnet 10.112.0.26/31metric 65535
external 10.112.0.14/31metric2 10000
external 10.112.0.26/31metric2 10000
external 10.112.0.28/31metric2 10000
external 10.10.0.0/21metric2 10000
external 10.10.97.67/32metric2 10000
router 10.10.97.68
distance 65835
router 10.10.97.73metric 65535
router 10.10.97.33metric 65535
stubnet 10.112.0.20/31metric 65535
stubnet 10.112.0.22/31metric 65535
external 10.112.0.20/31metric2 10000
external 10.112.0.22/31metric2 10000
external 10.10.97.68/32metric2 10000
router 10.10.97.69
distance 65535
router 10.10.97.66metric 65535
router 10.10.97.67metric 65535
stubnet 10.112.0.24/31metric 65535
stubnet 10.112.0.26/31metric 65535
external 10.112.0.24/31metric2 10000
external 10.112.0.26/31metric2 10000
external 10.10.97.69/32metric2 10000
router 10.10.97.72
distance 2300
router 10.10.97.33metric 2000
router 10.10.97.33metric 2000
router 10.10.97.33metric 2000
router 10.10.97.33metric 2000
router 10.10.97.73metric 2000
router 10.10.97.73metric 2000
stubnet 10.112.0.0/31metric 2000
stubnet 10.112.0.2/31metric 2000
stubnet 10.112.0.4/31metric 2000
stubnet 10.112.0.6/31metric 2000
stubnet 10.112.0.8/31metric 2000
stubnet 10.112.0.10/31metric 2000
external 0.0.0.0/0metric2 10000
external 10.112.0.0/31metric2 10000
external 10.112.0.2/31metric2 10000
external 10.112.0.4/31metric2 10000
external 10.112.0.6/31metric2 10000
external 10.112.0.8/31metric2 10000
external 10.112.0.10/31metric2 10000
external 10.10.97.72/32metric2 10000
external 100.105.99.0/30metric2 10000
router 10.10.97.73
distance 310
router 10.10.97.72metric 2000
router 10.10.97.72metric 2000
router 10.10.97.33metric 10
router 10.10.97.66metric 300
router 10.10.97.68metric 65535
stubnet 10.112.0.8/31metric 2000
stubnet 10.112.0.10/31metric 2000
stubnet 10.112.0.12/31metric 10
stubnet 10.112.0.16/31metric 300
stubnet 10.112.0.20/31metric 65535
external 0.0.0.0/0metric2 10000
external 10.112.0.8/31metric2 10000
external 10.112.0.10/31metric2 10000
external 10.112.0.12/31metric2 10000
external 10.112.0.16/31metric2 10000
external 10.112.0.20/31metric2 10000
external 10.10.8.0/21metric2 10000
external 10.10.97.73/32metric2 10000
external 188.170.160.52/30metric2 10000
-- 

Regards,
Mikhail V. Majorov
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