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Tag Archives: ccna
An introduction to Point-to-Point Protocol
The big picture PPP is a layer 2 WAN technology that is designed to establish connection between two nodes over a variety of network mediums. Features 1. It has built-in error detection. 2. Monitoring the quality of the link before … Continue reading
Posted in PPP, WAN
Tagged ccie, ccna, ccnp, point-to-point protocol, PPP, PPP finite state machine, PPP link phases
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Frame relay: Multilink point to point frame relay
Reference: http://www.cisco.com/en/US/docs/ios/12_2s/feature/guide/fs_mfr.html Multilink Frame Relay (FRF.16.1) 1. This technology aggregates multiple number of physical serial interfaces into one bundle. a. This provides link redundancy i.e. if a physical link of a bundle has failed, the frame relay link will still be … Continue reading
Frame-relay: Inverse ARP
Frame relay is a packet switching technology that emulates like a switch. Switch uses ARP broadcast to find out the mac address of the host so that switch can forward the frame to the destined switch port. Frame relay however … Continue reading
Spanning Tree Protocol (802.1D)
This protocol prevents bridging loop created by redundant links within switch network. STP calculation will make switch/es block its own port so that the switch path is one straight line and not a loop. This is perhaps the most confusing … Continue reading
Posted in High Availability, Switch
Tagged 802.1D, bridge id, bridge priority, ccie, ccna, ccnp, Cisco switch, lowest bridge ID, port priority, portfast, root port, spanning tree protocol, STP, STP port cost, what are STP port roles, what is root port, what is Spanning Tree Protocol, what is STP, what is STP port states
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Catalyst Switch: Turn off trunking negotiation
To turn off dynamic trunking protocol (DTP) and use dot1q standard. It is recommended to turn off trunking protocol and put vtp to transparent mode, this is because a newly introduced Catalyst switch may form undesired switch topology and if … Continue reading
Posted in Switch, Vlan
Tagged catalyst 3560, ccna, dynamic auto, dynamic desirable, dynamic trunking protocol, vlan
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Catalyst Switch: No trunks is formed
I have connected two Cisco Catalyst 3560 switches together by a pair of fibre cables. No trunk was formed. The default interface configuration for Catalyst 3560 is dynamic auto, in Catalyst 3550 the default was dynamic desirable. Dynamic desirable is … Continue reading
Posted in Switch, Vlan
Tagged catalyst switch, ccie routing and switching, ccna, ccnp, dynamic auto, dynamic desirable, vlan, vlan trunk
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