tcpdump...

you need this...

arteq@bo:~$ sudo tcpdump -i eth0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
10:51:17.846539 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:19.846812 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:21.846758 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:22.449605 IP 10.1.1.100 > ospf-all.mcast.net: OSPFv2, Hello, length 60
10:51:22.721785 IP6 fe80::ea40:f2ff:fe0e:de63.mdns > ff02::fb.mdns: 0 PTR (QM)? 100.1.1.10.in-addr.arpa. (41)
10:51:22.721844 IP bo.local.mdns > 224.0.0.251.mdns: 0 PTR (QM)? 100.1.1.10.in-addr.arpa. (41)
10:51:23.722828 IP6 fe80::ea40:f2ff:fe0e:de63.mdns > ff02::fb.mdns: 0 PTR (QM)? 100.1.1.10.in-addr.arpa. (41)
10:51:23.722882 IP bo.local.mdns > 224.0.0.251.mdns: 0 PTR (QM)? 100.1.1.10.in-addr.arpa. (41)
10:51:23.847026 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:25.723958 IP6 fe80::ea40:f2ff:fe0e:de63.mdns > ff02::fb.mdns: 0 PTR (QM)? 100.1.1.10.in-addr.arpa. (41)
10:51:25.724015 IP bo.local.mdns > 224.0.0.251.mdns: 0 PTR (QM)? 100.1.1.10.in-addr.arpa. (41)
10:51:25.847111 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:25.929546 IP 10.1.1.1 > ospf-all.mcast.net: OSPFv2, Hello, length 60
10:51:26.961530
10:51:27.823882 IP6 fe80::ea40:f2ff:fe0e:de63.mdns > ff02::fb.mdns: 0 PTR (QM)? 251.0.0.224.in-addr.arpa. (42)
10:51:27.823934 IP bo.local.mdns > 224.0.0.251.mdns: 0 PTR (QM)? 251.0.0.224.in-addr.arpa. (42)
10:51:27.847266 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:28.573286 CDPv2, ttl: 180s, Device-ID 'R1', length 343
10:51:28.824754 IP6 fe80::ea40:f2ff:fe0e:de63.mdns > ff02::fb.mdns: 0 PTR (QM)? 251.0.0.224.in-addr.arpa. (42)
10:51:28.824804 IP bo.local.mdns > 224.0.0.251.mdns: 0 PTR (QM)? 251.0.0.224.in-addr.arpa. (42)
10:51:29.847189 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:30.826814 IP6 fe80::ea40:f2ff:fe0e:de63.mdns > ff02::fb.mdns: 0 PTR (QM)? 251.0.0.224.in-addr.arpa. (42)
10:51:30.826864 IP bo.local.mdns > 224.0.0.251.mdns: 0 PTR (QM)? 251.0.0.224.in-addr.arpa. (42)
10:51:31.847462 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:32.449963 IP 10.1.1.100 > ospf-all.mcast.net: OSPFv2, Hello, length 60
10:51:32.851064 IP6 fe80::ea40:f2ff:fe0e:de63.mdns > ff02::fb.mdns: 0 PTR (QM)? 99.1.1.10.in-addr.arpa. (40)
10:51:32.851114 IP bo.local.mdns > 224.0.0.251.mdns: 0 PTR (QM)? 99.1.1.10.in-addr.arpa. (40)
10:51:32.851408 IP bo.local.mdns > 224.0.0.251.mdns: 0*- [0q] 1/0/0 (Cache flush) PTR bo.local. (56)
10:51:32.979614 IP6 fe80::ea40:f2ff:fe0e:de63.mdns > ff02::fb.mdns: 0 PTR (QM)? 1.1.1.10.in-addr.arpa. (39)
10:51:32.979666 IP bo.local.mdns > 224.0.0.251.mdns: 0 PTR (QM)? 1.1.1.10.in-addr.arpa. (39)
10:51:33.847425 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:33.979580 IP6 fe80::ea40:f2ff:fe0e:de63.mdns > ff02::fb.mdns: 0 PTR (QM)? 1.1.1.10.in-addr.arpa. (39)
10:51:33.979628 IP bo.local.mdns > 224.0.0.251.mdns: 0 PTR (QM)? 1.1.1.10.in-addr.arpa. (39)
10:51:35.556188 IP 10.1.1.1 > ospf-all.mcast.net: OSPFv2, Hello, length 60
10:51:35.847817 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:35.981482 IP6 fe80::ea40:f2ff:fe0e:de63.mdns > ff02::fb.mdns: 0 PTR (QM)? 1.1.1.10.in-addr.arpa. (39)
10:51:35.981531 IP bo.local.mdns > 224.0.0.251.mdns: 0 PTR (QM)? 1.1.1.10.in-addr.arpa. (39)
10:51:36.962082
10:51:37.847650 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:39.847905 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:41.847891 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:42.450745 IP 10.1.1.100 > ospf-all.mcast.net: OSPFv2, Hello, length 60
10:51:43.848140 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:44.649659 IP 10.1.1.1 > ospf-all.mcast.net: OSPFv2, Hello, length 60
10:51:45.848205 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:46.962625
10:51:47.848361 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:49.848310 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:51.848590 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:52.451200 IP 10.1.1.100 > ospf-all.mcast.net: OSPFv2, Hello, length 60
10:51:53.726275 IP 10.1.1.1 > ospf-all.mcast.net: OSPFv2, Hello, length 60
10:51:53.848513 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:55.571570 CDPv2, ttl: 180s, Device-ID '3550-01.ozlan', length 362
10:51:55.848977 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43
10:51:56.963185
10:51:57.848747 STP 802.1w, Rapid STP, Flags [Learn, Forward], bridge-id 800a.00:0f:8f:fe:09:80.8001, length 43