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Tag Archives: ccnp
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: 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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Tshoot: A network was not shown in OSPFv3 routing table
Reference topology Refer to IPv6 Layer 3 topology. Reference explanation. While I was doing IPv6 redistribution from ripng to OSPFv3, I found that OSPFv3 routing table did not include the 2026::2:/122 network which is in the RIPng domain between DSW1 … Continue reading
EIGRP: Bandwidth Part2
R1#sh interfaces serial 0/0 Serial0/0 is up, line protocol is up Hardware is PowerQUICC Serial Description: This is a DCE to R2 Internet address is 10.0.1.1/24 MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload … Continue reading
EIGRP: Configuration and verification part1.1
*Mar 2 11:52:53.472: EIGRP: Received HELLO on Loopback1 nbr 10.1.1.1 *Mar 2 11:52:53.472: AS 100, Flags 0×0, Seq 0/0 idbQ 0/0 *Mar 2 11:52:53.472: EIGRP: Packet from ourselves ignored I made R1 advertise the route of the loopback1 interface, hello … Continue reading
EIGRP: Configuration and verification Part1
Scenario: You are tasked to configure EIGRP routing among various departments. Loopback1 of R1 is Engineering, loopback2 of R2 is Marketing, loopback3 of R3 is Sales. All physical connections have already been installed as shown in this logical network diagram. … Continue reading
