[quagga-users 14653] Re: [quagga-dev 16588] Re: Why ospf hello packet without Designated Router and Backup Designated Router?

Lennart Sorensen lsorense at csclub.uwaterloo.ca
Thu Mar 23 13:24:07 GMT 2017

On Thu, Mar 23, 2017 at 07:06:11PM +0800, 詹益晨 wrote:
> Hi Pual,
> The interface is gre tunnel, I print inet_ntoa (DR (oi)), but I saw
> =============================================================
> gretunnel is up
>   ifindex 13, MTU 1476 bytes, BW 0 Kbit <UP,POINTOPOINT,RUNNING,NOARP>
>   Internet Address, Area
>   MTU mismatch detection:enabled
>   Router ID, Network Type POINTOPOINT, Cost: 10
>   Transmit Delay is 1 sec, State Point-To-Point, Priority 1
>   No designated router on this network
>   No backup designated router on this network
>   Multicast group memberships: OSPFAllRouters
>   Timer intervals configured, Hello 10s, Dead 40s, Wait 40s, Retransmit 5
>     Hello due in 2.224s
>   Neighbor Count is 1, Adjacent neighbor count is 1
> ==============================================================
> If the network type is POINTOPOINT to cause Designated Router is
> How can I do to let it can work and packet with Designated Router IP.

By default linux gre tunnels don't do multicast.

Something like this could make it do so:

ip link set gretunnel multicast on

Would have to do that on both ends.  To make it permanent would require
puttings something in the network interface config to do that.

Len Sorensen

More information about the Quagga-users mailing list