PS: On a second thought, of course as-path-prepend will make the session
get dropped by the remote router, because my AS is not first in the path
anymore. My mistake, so please ignore that.
I checked some more looking glasses in the meantime and I can see
my-upstream my-asn 222222 at some of them. Only one looking glass showed
me my-upsteam my-asn 23456, so I'm thinking maybe everything is fine and
only this particular LG cannot display 4-byte ASN and uses 23456 instead?
Sorry for the noise in that case. :)
Am 21.05.2014 23:20, schrieb Markus:
Hi list!
I'm trying to prepend a customers 4-byte ASN to their prefixes. JunOS
12.3R2.5 on M7i. This is my config, simplified:
[routing-options static]
route a.a.a.a/22 {
next-hop b.b.b.b;
readvertise;
}
[policy-options]
policy-statement UPSTREAM-OUT {
term 1 {
from {
route-filter a.a.a.a/22 exact;
}
then {
as-path-expand 222222;
}
}
UPSTREAM-OUT is applied as export to my upstream's BGP peer. So far so
good:
admin@router# run show route advertising-protocol bgp my-upstream-ip
Prefix Nexthop MED Lclpref AS path
* a.a.a.a/22 Self 10 222222 I
But when I check a public looking glass I can see that 222222 becomes
23456:
3257 1299 my-upstream my-asn 23456
I changed "as-path-expand" to "as-path-prepend" and this resulted in the
BGP session to drop and I can see this in my log:
router rpd[1567]: bgp_read_v4_message:10289: NOTIFICATION received from
my-upstream-ip (External AS my-upstream): code 3 (Update Message Error)
subcode 11 (AS path attribute problem), Data: 40 02 0a 02 02 00
Does this maybe mean that my upstream routers software does not yet
support 4-byte ASNs?
I'm also doing the same to various peers and there it works fine. I can
see the path "my-asn 222222" in my peers looking glasses.
Thanks!
Markus
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