BIRD/OSPF HUB and Spoke topology (IPv6)

19 Feb 2014

      Dear all,

I am using Bird6 (rel. 1.3.11) on Fedora20 and try to build up a HUB and 
Spoke topology with IPv6:

we want to have 60-70 spokes, all in area 0, to propagate their 
/dev/eth0's IPv6 address (eg.:fed0:1:e005::1/64 -> eg.:fed0:1:e0xy::1/64 
->)  through an GRE-tunnel (IPv6-address 
fed0:1:ffff:ffff:ffff:ffff:x:0/124 ) to the HUB, but the HUB must not 
propagate any such spokes IPv6 address to any other Spoke.

HUB-IPv6 address:       on dev/eth0          fed0:1:a001::1

Spoke1-IPv6 address:      on dev/eth0          fed0:1:e005::1

Spoke2-IPv6 address:      on dev/eth0          fed0:1:e006::1

Spokex-IPv6 address:      on dev/eth0          fed0:1:e0xy::1

In order to full-fil this citerias, I tried to only export "directly 
connected" IPv6 addresses out of the HUB, but failed completely.
Pls. find 2 tested configuration alternatives of the HUB below:

Any idea or working config-examples, how a HUBnSpoke topology with BIRD 
can be implemented, is very much appreciated

thx

Ar

Config-alternative 1)

# Configure logging
log syslog { debug, trace, info, remote, warning, error, auth, fatal, bug 
};

# Override router ID
router id 172.16.128.10;

# Define a route filter...
filter ospf_rt_export {
       if net = fed0:1:a001::/64 then accept;
       else reject;
}

# The direct protocol automatically generates device routes to
# all network interfaces. Can exist in as many instances as you wish
# if you want to populate multiple routing tables with device routes.
protocol direct {
        interface "GRE*-ETH6", "tap*";  # Restrict network interfaces it 
works with
}

# This pseudo-protocol performs synchronization between BIRD's routing
# tables and the kernel. If your kernel supports multiple routing tables
# (as Linux 2.2.x does), you can run multiple instances of the kernel
# protocol and synchronize different kernel tables with different BIRD 
tables.
protocol kernel {
        learn;                  # Learn all alien routes from the kernel
        persist;                # Don't remove routes on bird shutdown
        scan time 20;           # Scan kernel routing table every 20 
seconds
#       import none;            # Default is import all
        export all;             # Default is export none
#       kernel table 5;         # Kernel table to synchronize with 
(default: main)
}

# This pseudo-protocol watches all interface up/down events.
protocol device {
        scan time 10;           # Scan interfaces every 10 seconds
}

# Static routes (again, there can be multiple instances, so that you
# can disable/enable various groups of static routes on the fly).
protocol static {
#       disabled;               # Disable by default
#       table testable;         # Connect to a non-default table
}

protocol ospf OIPv6 {
        tick 2;
#       rfc1583compat yes;
        export filter ospf_rt_export;
        import all;
        area 0.0.0.0 {
#               stub no;
                 interface "GRE*-ETH6" {
                        hello 9;
                        retransmit 6;
                        cost 10;
                        transmit delay 5;
                        dead count 5;
                        wait 50;
                        type broadcast;
#                       authentication simple;
#                       password "pass";
                };
                };
        };

Config-alternative 2)

# Configure logging
log syslog { debug, trace, info, remote, warning, error, auth, fatal, bug 
};

# Override router ID
router id 172.16.128.10;

# Define a route filter...

filter ospf_redistconn_export {
# redistribute connected
    if ( source = RTS_DEVICE ) then {
         print "net accepted:", net;
        ospf_metric2 = 20;
        accept;
    }

    else reject;
}

#filter sink { reject; }
#filter okay { accept; }

# The direct protocol automatically generates device routes to
# all network interfaces. Can exist in as many instances as you wish
# if you want to populate multiple routing tables with device routes.
protocol direct {
        interface "GRE*-ETH6", "tap*";  # Restrict network interfaces it 
works with
}

# This pseudo-protocol performs synchronization between BIRD's routing
# tables and the kernel. If your kernel supports multiple routing tables
# (as Linux 2.2.x does), you can run multiple instances of the kernel
# protocol and synchronize different kernel tables with different BIRD 
tables.
protocol kernel {
        learn;                  # Learn all alien routes from the kernel
        persist;                # Don't remove routes on bird shutdown
        scan time 20;           # Scan kernel routing table every 20 
seconds
#       import none;            # Default is import all
        export all;             # Default is export none
#       kernel table 5;         # Kernel table to synchronize with 
(default: main)
}

# This pseudo-protocol watches all interface up/down events.
protocol device {
        scan time 10;           # Scan interfaces every 10 seconds
}

# Static routes (again, there can be multiple instances, so that you
# can disable/enable various groups of static routes on the fly).
protocol static {
#       disabled;               # Disable by default
}

protocol ospf OIPv6 {
        tick 2;
#       rfc1583compat yes;
        export filter ospf_redistconn_export;
        import all;
        area 0.0.0.0 {
#               stub no;
                interface "GRE*-ETH6" {
                        hello 9;
                        retransmit 6;
                        cost 10;
                        transmit delay 5;
                        dead count 5;
                        wait 50;
                        type broadcast;
#                       authentication simple;
#                       password "pass";
                };
                };
        };

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BIRD/OSPF HUB and Spoke topology (IPv6)

arno.odermatt＠ch.schindler.com