Packet Captures
Viewing 1 - 14 of 14
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MSTP_Intra-Region_BPDUs.cap (1.7 KB)
| Packets: 10 | Duration: 10s | Downloads: 3977 |
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.
QinQ.pcap.cap (184 bytes)
| Packets: 2 | Duration: 2s | Downloads: 7558 |
ARP requests having two vlan IDs attached (QinQ)
LLDP_and_CDP.cap (4.0 KB)
| Packets: 12 | Duration: 98s | Downloads: 7025 |
LLDP and CDP advertisements sent between two switches, S1 and S2.
802.1Q_tunneling.cap (5.0 KB)
| Packets: 26 | Duration: 35s | Downloads: 10660 |
rpvstp-trunk-native-vid5.pcap.cap (1.8 KB)
| Packets: 22 | Duration: 11s | Downloads: 6668 |
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).
rpvstp-trunk-native-vid1.pcap.cap (6.4 KB)
| Packets: 81 | Duration: 45s | Downloads: 5342 |
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).
rpvstp-access.pcap.cap (3.7 KB)
| Packets: 49 | Duration: 77s | Downloads: 4772 |
Rapid per-VLAN spanning tree capture of an access port (without portfast), configured in VLAN 5.
PAGP.cap (2.5 KB)
| Packets: 25 | Duration: 95s | Downloads: 4503 |
LACP.cap (2.8 KB)
| Packets: 20 | Duration: 112s | Downloads: 6148 |
UDLD.cap (3.3 KB)
| Packets: 29 | Duration: 93s | Downloads: 4675 |
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.
- Categories: Cisco-proprietary, Switching
- Protocols: Ethernet, LLC, UDLD
ICMP_across_dot1q.cap (1.7 KB)
| Packets: 15 | Duration: 35s | Downloads: 5063 |
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.
DTP.cap (934 bytes)
| Packets: 10 | Duration: 120s | Downloads: 3831 |
Dynamic Trunking Protocol (DTP) emanated from a Catalyst 3560 every 60 seconds, both with and without ISL encapsulation.
802.1w_rapid_STP.cap (2.3 KB)
| Packets: 30 | Duration: 56s | Downloads: 4850 |
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.
802.1D_spanning_tree.cap (1.1 KB)
| Packets: 14 | Duration: 26s | Downloads: 5676 |
IEEE 802.1D Spanning Tree Protocol (STP) advertisements sent every two seconds.
Viewing 1 - 14 of 14
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