[Xorp-users] OSPF network advertisements

[Atanu Ghosh]

Hi,

This is a known problem <http://www.xorp.org/bugzilla/show_bug.cgi?id=566>.

Enabling passive sets the interface in the state Loopback, which requires
that that host route is announced. There should probably be distinct
loopback and passive switches.

This patch should solve your problem.

----------------------------------------
Index: peer.cc
===================================================================
RCS file: /usr/local/www/data/cvs/xorp/ospf/peer.cc,v
retrieving revision 1.237
diff -u -r1.237 peer.cc
--- peer.cc     28 Mar 2006 03:06:54 -0000      1.237
+++ peer.cc     5 Apr 2006 19:05:23 -0000
@@ -2164,7 +2164,7 @@
        // XXX - We should be checking to see if this is p2p unnumbered.
        router_link.set_type(RouterLink::stub);
        router_link.set_link_id(ntohl(get_interface_address().addr()));
-       router_link.set_link_data(0xffffffff);
+       router_link.set_link_data(get_network_mask());
        router_link.set_metric(0);
        router_links.push_back(router_link);
        return;
----------------------------------------

     Atanu.

>>>>> "Andy" == Andy Bavier <acb@cs.princeton.edu> writes:

    Andy> Hi,
    Andy> I am trying to configure XORP to advertise routes to a local network
    Andy> using OSPF.  My problem is that only the interface *address* appears
    Andy> to be advertised, and not the entire network -- in other words, only a
    Andy> /32 address is inserted into the routing table and not a /24.  My
    Andy> question is, how to get OSPF to advertise and route to the /24?

    Andy> My OSPF configuration looks like this.  Interface 'eth0' is on a /24
    Andy> network.  I expected that by setting eth0 as 'passive' I could get
    Andy> OSPF to advertise routes for the attached network, without actually
    Andy> running OSPF on this interface:

    Andy> protocols {
    Andy> ospf4 {
    Andy> router-id:  128.112.139.96
    Andy> area 0.0.0.0 {

    Andy> interface eth0 {
    Andy> vif eth0 {
    Andy> address 10.32.11.2 {
    Andy> interface-cost: 1
    Andy> passive: true
    Andy> }
    Andy> }
    Andy> }

    Andy> interface eth1 {
    Andy> vif eth1 {
    Andy> address 192.168.1.2 {
    Andy> interface-cost: 1
    Andy> }
    Andy> }
    Andy> }

    Andy> interface eth2 {
    Andy> vif eth2 {
    Andy> address 192.168.2.2 {
    Andy> interface-cost: 1
    Andy> }
    Andy> }
    Andy> }
    Andy> }
    Andy> }
    Andy> }


    Andy> OSPF appears to be working correctly, and 'eth0' is being
    Andy> advertised. However, all of the installed routes have masks of
    Andy> 255.255.255.255:

    Andy> # route
    Andy> Kernel IP routing table
    Andy> Destination     Gateway         Genmask         Flags Metric Ref
    Andy> Use Iface
    Andy> 192.168.1.2     192.168.2.2     255.255.255.255 UGH   1      0        0 eth2
    Andy> 192.168.2.2     192.168.2.2     255.255.255.255 UGH   1      0        0 eth2
    Andy> 10.32.11.2      192.168.2.2     255.255.255.255 UGH   1      0        0 eth2
    Andy> [...]


    Andy> From what I can tell, it looks like this mask is being propagated in
    Andy> the LSAs themselves:

    Andy> root@planetlab-3.cs.princeton.edu> show ospf4 database detail
    Andy> OSPF link state database, Area 0.0.0.0
    Andy> Router-LSA:
    Andy> LS age  283 Options  0x2 DC: 0 EA: 0 N/P: 0 MC: 0 E: 1 LS type 0x1
    Andy> Link State ID 128.112.139.96 Advertising Router 128.112.139.96 LS
    Andy> sequence number 0x80000002 LS checksum 0x7da7 length 72
    Andy> Nt-bit false
    Andy> V-bit false
    Andy> E-bit false
    Andy> B-bit false
    Andy> Type 3 Stub network Subnet number 10.32.11.2 Mask
    Andy> 255.255.255.255 Metric 0
    Andy> Type 3 Stub network Subnet number 192.168.1.2 Mask
    Andy> 255.255.255.255 Metric 0
    Andy> Type 3 Stub network Subnet number 192.168.2.2 Mask
    Andy> 255.255.255.255 Metric 0


    Andy> Does anyone have insights or suggestions on what I need to do to
    Andy> advertise a 255.255.255.0 netmask for eth0?

    Andy> Thanks,
    Andy> Andy

    Andy> _______________________________________________
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    Andy> Xorp-users@xorp.org
    Andy> http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-users