BGP question

Mailman List Mirror (Read Only)
1

Hi all,

I'm having difficulties to understand why I am not advertising a certain
customer range to my upstream.

I can see this range in my BGP table 3 times.

show ip bgp customer_range

Number of BGP Routes matching display condition : 3

Status codes: s suppressed, d damped, h history, * valid, > best, i internal

Origin codes: i - IGP, e - EGP, ? - incomplete

    Network Next Hop Metric
LocPrf Weight Path

*>i customer_range Local IX 110
0 XXXX YYYY i

* customer_range upstream provider 100
0 AAAA BBBB XXXX YYYY i

* customer_range my customer 0 120
0 YYYY YYYY i

       Last update to IP routing table: 0h23m34s, 1 path(s) installed:

       Route is not advertised to any peers

customer_range = each time the same /24

But it seems to choose the set the one as local IX as best.

When I disable local IX it sets the one with my upstream provider as best.

Shouldn't it set the customer_range I receive from my customer as best since
it's highest local pref and advertise it to my upstream provider peer?

Regards,

Rens

2

*>i customer_range Local IX 110
0 XXXX YYYY i
* customer_range upstream provider 100
0 AAAA BBBB XXXX YYYY i
* customer_range my customer 0 120
0 YYYY YYYY i

       Last update to IP routing table: 0h23m34s, 1 path(s) installed:
       Route is not advertised to any peers

...

But it seems to choose the set the one as local IX as best.

When I disable local IX it sets the one with my upstream provider as best.

Shouldn't it set the customer_range I receive from my customer as best since
it's highest local pref and advertise it to my upstream provider peer?

Yes, which means there must be something else wrong with that route to
keep it from getting installed as best path. That CLI output smells like
Foundry, and I don't remember exactly how it would show up, but on Cisco
for example "show ip bgp" not only shows your rib but also the adj rib
in for neighbors which have soft-reconfig enabled. This would show up as
(received) but not say "used", though again I'm not sure if Foundry does
this or how it would show up.

If you aren't doing something silly like outright rejecting the route in
the route-map or prefix-list on the neighbor, make sure the next-hop is
valid and reachable. IIRC Foundry doesn't do bgp next-hop recursion by
default, you have to manually enable it. If I remember my Foundry BGP
correctly (despite many years and a lot of therapy trying to repress
those memories) you can see more details with "show ip bgp routes detail
x.x.x.x".

3

That routes detail command doesn't really give me that much extra info over
the other one.

Could it be that my import at RIPE for my customer AS is set to action
pref=100 instead of 120 is causing this?

Regards,

Rens