Re: [MT-AU Public] Route selection

17 Jun 2017

      Route 0 has a shorter AS-PATH. Increase the localpref on your prefered path

BGP cares most about as-path length

On 16 Jun 2017 10:16 PM, "Matthew Enger" <m.enger@xi.com.au> wrote:

[admin@xi_mel_primary] /ip route> print detail where dst-address =
202.52.129.0/24
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r -
rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P -
prohibit
 0 ADb  dst-address=202.52.129.0/24 gateway=103.85.36.33
gateway-status=103.85.36.33 recursive via 103.51.112.4 vrrp1 distance=200
scope=40 target-scope=30
        bgp-as-path="7490,55575" bgp-local-pref=100 bgp-prepend=1
bgp-origin=igp bgp-communities=7490:2,58941:0,58941:1001
        bgp-ext-communities="RT:58941:0,RT:58941:1001"
received-from=xi_syd_primary

 1  Db  dst-address=202.52.129.0/24 gateway=218.100.78.11
gateway-status=218.100.78.11 reachable via  Vic-IX-Traffic distance=20
scope=40 target-scope=10
        bgp-as-path="4826,7490,55575" bgp-med=0 bgp-origin=igp
bgp-communities=4739:999,4826:1000,4826:5203,4826:7000,4826:
52034,7490:2,10084:2513
        received-from=VIC-IX-IPv4-1

 2  Db  dst-address=202.52.129.0/24 gateway=218.100.78.11
gateway-status=218.100.78.11 reachable via  Vic-IX-Traffic distance=20
scope=40 target-scope=10
        bgp-as-path="4826,7490,55575" bgp-med=0 bgp-origin=igp
bgp-communities=4739:999,4826:1000,4826:5203,4826:7000,4826:
52034,7490:2,10084:2513
        received-from=VIC-IX-IPv4-2

route 0 is coming from ibgp from our Sydney router, 1 and 2 are off bgp
directly connected.

Matthew Enger | Managing Director
PO Box 3279, The Pines, Victoria, 3109
T 1300 789 299 D 03 9909 3104 M 0406 532 792 F 03 8611 7946
m.enger@xi.com.au | www.xi.com.au

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On 16/6/17, 9:13 pm, "Public on behalf of Mike Everest" <
public-bounces@talk.mikrotik.com.au on behalf of mike@duxtel.com> wrote:

    Yes, normally lowest distance is higher preference.

    There must be something else in action here - routing mark or smaller
subnet
    etc.  What does "/ip route print detail" tell us?

    Cheers,  Mike.

    > -----Original Message-----
    > From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of
    > Matthew Enger
    > Sent: Friday, 16 June 2017 7:34 PM
    > To: public@talk.mikrotik.com.au
    > Subject: [MT-AU Public] Route selection
    >
    > Hello,
    >
    > I have three routes below:
    >
    > Dab        202.52.129.0/24                 103.85.36.33 recursive via
    103.51.112.4
    > vrrp 1         200
    > Db           202.52.129.0/24                 218.100.78.11 reachable
    Vic-IX-Traffic
    > 20
    > Db           202.52.129.0/24                 218.100.78.11 reachable
    Vic-IX-Traffic
    > 20
    >
    >
    > My reading of
    > https://wiki.mikrotik.com/wiki/Manual:Route_Selection_
Algorithm_in_Route
    > rOS says that the active route should be the distance of 20, but it is
    selecting
    > 200.
    >
    > Is this a bug or am I not reading it right?
    >
    > Running  6.37.5 if that helps anyone.
    >
    >
    >
    >
    >
    >
    > Matthew Enger | Managing Director
    > PO Box 3279, The Pines, Victoria, 3109
    > T 1300 789 299 D 03 9909 3104 M 0406 532 792 F 03 8611 7946
    > m.enger@xi.com.au | www.xi.com.au
    >
    >
    >
    > This email message and any attachments are the property of X
Integration.
    > The contents of this email are copyright and may also be confidential
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is
    not
    > intended that either confidentiality or privilege be waived or lost by
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    > delivery to you. Please notify us immediately and delete this
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    > if received in error. Consider the environment before printing this
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Re: [MT-AU Public] Route selection

Stephen Schwetz