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Protocol »
Logical Link Control
(Info)
Viewing 1 - 9 of 9 captures
802.1w_rapid_STP.cap (2.2 KB)
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. UDLD.cap (3.3 KB)
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.
3560_CDP.cap (1.2 KB)
Cisco Discovery Protocol (CDP) advertisements from a Catalyst 3560. Note how much information is offered to a potential attacker.
802.1D_spanning_tree.cap (1.1 KB)
IEEE 802.1D Spanning Tree Protocol (STP) advertisements sent every two seconds. DTP.cap (934 bytes)
Dynamic Trunking Protocol (DTP) emanated from a Catalyst 3560 every 60 seconds, both with and without ISL encapsulation. ISIS_level1_adjacency.cap (27.4 KB)
Routers 2 and 3 form an IS-IS level 2 adjacency.
ISIS_external_lsp.cap (17.0 KB)
R2 floods the external routes redistributed from RIP into area 10. Packet #9 includes the IP external reachability TLV. Capture perspective from R3's 10.0.10.1 interface.
ISIS_level2_adjacency.cap (51.8 KB)
Routers 3 and 4 form an IS-IS level 2 adjacency.
3725_CDP.cap (390 bytes)
Cisco Discovery Protocol (CDP) from FastEthernet0/0 of a Cisco 3725 router.
Viewing 1 - 9 of 9 captures
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