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Packet Captures

MSTP_Intra-Region_BPDUs.cap 1.7 KB

Submitted May 1, 2012 by lobo

MSTP BPDUs captured on an intra-region root port.

00:1f:27:b4:7d:80 - CIST Root (is in another MSTP Region)
00:16:46:b5:8c:80 - CIST Regional Root, Root for Instance 0, 2
00:1e:f7:05:a8:80 - Root for Instance 1

Notice in frame 1 that 00:1e:f7:05:a8:80 uses 32768.00:16:46:b5:8c:80 (Regional Root BID) as bridge ID in the main STP header to make the region appear as a single bridge.

LLC STP VLAN

Packets: 10 Duration: 10s Downloads: 7925

QinQ.pcap.cap 184 bytes

Submitted Jan 9, 2011 by Ysaad

ARP requests having two vlan IDs attached (QinQ)

ARP Ethernet VLAN

Packets: 2 Duration: 2s Downloads: 10720

LLDP_and_CDP.cap 4.0 KB

Submitted Oct 3, 2010

LLDP and CDP advertisements sent between two switches, S1 and S2.

CDP Ethernet LLC LLDP

Packets: 12 Duration: 98s Downloads: 9747

802.1Q_tunneling.cap 5.0 KB

Submitted Jun 30, 2010

CDP Ethernet IP LLC VLAN

Packets: 26 Duration: 35s Downloads: 14340

rpvstp-trunk-native-vid5.pcap.cap 1.8 KB

Submitted Dec 16, 2009 by einval

Rapid per-VLAN spanning tree capture of a trunk port, configured with native VLAN 5, VLAN 1 is also active over the trunk.

Capture shows that 3 BPDUs are sent out, one for classic STP (Frame 4, for example), one for the native VLAN 5 (not tagged - Frame 5) and one for each other active VLAN (tagged - Frame 3).

The PVST BPDUs contain the VLAN ID at the end of the frame (01 and 05, respectively).

DTP Ethernet LLC LOOP STP VLAN VTP

Packets: 22 Duration: 11s Downloads: 9009

rpvstp-trunk-native-vid1.pcap.cap 6.4 KB

Submitted Dec 16, 2009 by einval

Rapid per-VLAN spanning tree capture of a trunk port, configured with native VLAN 1 (default), VLAN 5 is also active over the trunk.

Capture shows that 3 BPDUs are sent out, one for classic STP (Frame 4, for example), one for the native VLAN (not tagged - Frame 3) and one for each other active VLAN (tagged - Frame 5).

The PVST BPDUs contain the VLAN ID at the end of the frame (01 and 05, respectively).

DTP Ethernet LLC LOOP STP VLAN VTP

Packets: 81 Duration: 45s Downloads: 8260

rpvstp-access.pcap.cap 3.7 KB

Submitted Dec 16, 2009 by einval

Rapid per-VLAN spanning tree capture of an access port (without portfast), configured in VLAN 5.

DNS Ethernet IP LLC LOOP STP UDP

Packets: 49 Duration: 77s Downloads: 6224

PAGP.cap 2.5 KB

Submitted Nov 15, 2009

Ethernet LLC PAGP

Packets: 25 Duration: 95s Downloads: 5645

LACP.cap 2.8 KB

Submitted Nov 15, 2009

Ethernet LACP

Packets: 20 Duration: 112s Downloads: 9388

UDLD.cap 3.3 KB

Submitted Sep 14, 2009

Unidirectional Link Detection (UDLD) is used to monitor the status of a link between a Catalyst 2960 and a Catalyst 3560. Note that echos are initially sent at very small intervals, gradually throttling back to the configured interval of 15 seconds.

Ethernet LLC UDLD

Packets: 29 Duration: 93s Downloads: 6319

ICMP_across_dot1q.cap 1.7 KB

Submitted Sep 14, 2009

A ping issued from 192.168.123.2 to 192.168.123.1 is encapsulated with an IEEE 802.1Q header, placing it in VLAN 123.

ARP Ethernet ICMP IP VLAN

Packets: 15 Duration: 35s Downloads: 7242

DTP.cap 934 bytes

Submitted Sep 14, 2009

Dynamic Trunking Protocol (DTP) emanated from a Catalyst 3560 every 60 seconds, both with and without ISL encapsulation.

DTP Ethernet ISL LLC

Packets: 10 Duration: 120s Downloads: 5317

802.1w_rapid_STP.cap 2.3 KB

Submitted Sep 14, 2009

Rapid Spanning Tree Protocol BPDUs are received from a Catalyst switch after connecting to a port not configured for PortFast. The port transitions through the blocking and learning states before issuing a topology change notification (packet #30) and transitioning to the forwarding state.

Ethernet LLC STP

Packets: 30 Duration: 56s Downloads: 7092

802.1D_spanning_tree.cap 1.1 KB

Submitted Sep 14, 2009

IEEE 802.1D Spanning Tree Protocol (STP) advertisements sent every two seconds.

Ethernet LLC STP

Packets: 14 Duration: 26s Downloads: 8643