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The following switch port mode settings exist: [2] [3] Access — Puts the Ethernet port into permanent nontrunking mode and negotiates to convert the link into a nontrunk link. The Ethernet port becomes a nontrunk port even if the neighboring port does not agree to the change. Trunk — Puts the Ethernet port into permanent trunking mode and ...
To prevent this attack on Cisco IOS, use one of the following methods: [2]: 163 1. Ensure that ports are not set to negotiate trunks automatically by disabling DTP: Switch (config-if)# switchport nonegotiate. 2. Ensure that ports that are not meant to be trunks are explicitly configured as access ports Switch (config-if)# switchport mode access
A limitation of Port Aggregation Protocol is that all the physical ports in the aggregation group must reside on the same switch. Cisco's 6500 and the 4500E platforms, remove this limitation using Virtual Switching System (VSS), [1] which allows port channels to be split between two chassis. PAgP is not supported in Cisco Nexus Switches.
VLAN Trunking Protocol (VTP) is a Cisco proprietary protocol that propagates the definition of Virtual Local Area Networks on the whole local area network. [1] To do this, VTP carries VLAN information to all the switches in a VTP domain. VTP advertisements can be sent over 802.1Q, and ISL trunks.
In the extreme case (i.e. micro-segmentation), each device is directly connected to a switch port dedicated to the device. In contrast to an Ethernet hub, there is a separate collision domain on each switch port. This allows computers to have dedicated bandwidth on point-to-point connections to the network and also to run in full-duplex mode.
VLT is a layer-2 link aggregation protocol between end-devices (servers) connected to (different) access-switches, offering these servers a redundant, load-balancing connection to the core-network in a loop-free environment, eliminating the requirement for the use of a spanning-tree protocol. [2]
An access interface cannot participate in two different primary VLANs, limited to one private VLAN. Spanning Tree Protocol (STP) settings. Cannot be configured on VLAN 1 or VLANs 1002 to 1005 as primary or secondary VLANs. As they are special VLANs.
Port mirroring on a Cisco Systems switch is generally referred to as Switched Port Analyzer (SPAN) or Remote Switched Port Analyzer (RSPAN). Other vendors have different names for it, such as Roving Analysis Port (RAP) on 3Com switches.