[Xorp-hackers] BGP and policy problem

[Atanu Ghosh]

Hi,

This problem is now fixed in CVS.

     Atanu.

Revision  Changes                               Path
1.34      +2 -2;  commitid: feca480eb05941a7;   xorp/bgp/bgp_varrw.cc

>>>>> "Stefan" == Stefan Gula <steweg at ynet.sk> writes:

    Stefan> Hi
    Stefan> I am currently trying to establish eBGP sessions with another XORP
    Stefan> eBGP and iBGP routers like this:

    Stefan> Network A,B,C,D are connected to Router R1 and R2 in AS1. They are
    Stefan> distributed through OSPF, which works fine. Now there is Network E and
    Stefan> F on Router R3 which is in AS2. What I try to achive is that traffic
    Stefan> from AS1 going to network E goes through R2 a to network F goes
    Stefan> through R1. I achieved this by applying import policy on R1 and R2 by
    Stefan> the way of localpref. What I am unable to achive is applying also
    Stefan> export policy on R1 and R2 with MED attribute to make sure that R3
    Stefan> will choose the same way that traffic comes in as it goes out.

    Stefan> Here is my configuration
    Stefan> root at R1# show policy
    Stefan> policy-statement "bel_out" {
    Stefan> term a {
    Stefan> from {
    Stefan> protocol: "connected"
    Stefan> network4-list: "my_routes"
    Stefan> }
    Stefan> to {
    Stefan> neighbor: 10.1.2.18..10.1.2.18
    Stefan> }
    Stefan> then {
    Stefan> med: 100
    Stefan> accept {
    Stefan> }
    Stefan> }
    Stefan> }
    Stefan> term b {
    Stefan> from {
    Stefan> protocol: "ospf4"
    Stefan> }
    Stefan> to {
    Stefan> neighbor: 10.1.2.18..10.1.2.18
    Stefan> }
    Stefan> then {
    Stefan> med: 100
    Stefan> accept {
    Stefan> }
    Stefan> }
    Stefan> }
    Stefan> }
    Stefan> policy-statement "bel_in" {
    Stefan> term a {
    Stefan> from {
    Stefan> neighbor: 10.1.2.18..10.1.2.18
    Stefan> network4-list: "management"
    Stefan> }
    Stefan> then {
    Stefan> localpref: 100
    Stefan> accept {
    Stefan> }
    Stefan> }
    Stefan> }
    Stefan> }
    Stefan> network4-list "my_routes" {
    Stefan> network 192.168.2.0/26
    Stefan> network 192.168.2.128/26
    Stefan> network 10.1.2.16/30
    Stefan> }
    Stefan> network4-list "management" {
    Stefan> network 10.1.4.0/24
    Stefan> }

    Stefan> root at R1# show protocols bgp
    Stefan> bgp-id: 192.168.2.1
    Stefan> local-as: 65535
    Stefan> peer "10.1.2.18" {
    Stefan> local-ip: "10.1.2.17"
    Stefan> as: 65534
    Stefan> next-hop: 10.1.2.17
    Stefan> }
    Stefan> peer "192.168.2.2" {
    Stefan> local-ip: "192.168.2.1"
    Stefan> as: 65535
    Stefan> next-hop: 192.168.2.1
    Stefan> }
    Stefan> traceoptions {
    Stefan> flag {
    Stefan> all {
    Stefan> disable: true
    Stefan> }
    Stefan> }
    Stefan> }
    Stefan> export: "bel_out"
    Stefan> import: "bel_in"


    Stefan> in logs it shows something like this:
    Stefan> [ 2008/02/26 13:06:18 WARNING xorp_rib RIB ] Unable to complete XRL:
    Stefan> del_route4 for bgp route: Dst: 10.1.2.18/32 Vif: vlan4 NextHop:
    Stefan> NH:192.168.2.1 Metric: 2 Protocol: ospf PolicyTags: 5
    Stefan> [ 2008/02/26 13:06:14 INFO xorp_rib RIB ] Received death event for
    Stefan> protocol bgp shutting down -------
    Stefan> OriginTable: ebgp
    Stefan> next table = Merged:(ebgp)+(ibgp)
    Stefan> [ 2008/02/26 13:06:14 INFO xorp_rib RIB ] Received death event for
    Stefan> protocol bgp shutting down -------
    Stefan> OriginTable: ebgp
    Stefan> next table = Merged:(ebgp)+(ibgp)
    Stefan> [ 2008/02/26 13:06:14 INFO xorp_rib RIB ] Received death event for
    Stefan> protocol bgp shutting down -------
    Stefan> OriginTable: ebgp
    Stefan> next table = Merged:(ebgp)+(ibgp)
    Stefan> [ 2008/02/26 13:06:14 INFO xorp_rib RIB ] Received death event for
    Stefan> protocol bgp shutting down -------
    Stefan> OriginTable: ebgp
    Stefan> next table = Merged:(ebgp)+(ibgp)


    Stefan> similar configuration is on R2 and also the same problem. Unable to
    Stefan> apply import and export policy together. On R3 there is everything Ok.
    Stefan> So please can somebody point me to the right direction where is the
    Stefan> problem?

    Stefan> Thanks for any ideas

    Stefan> -- 
    Stefan> Stefan Gula, CCNP

    Stefan> _______________________________________________
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