Author: renjithbs
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Why we need Proxy ARP ? Is there any replacement ?
Proxy ARP is a mechanism which allows two subnets to communicate with each other without configuring Default Gateway. I am going to explain it with a simple topology. Let’s check the configurations hostname R3 ! ! no ip routing ! ! interface Ethernet0/1 ip address 10.10.10.1 255.255.255.0 no ip route-cache hostname R1
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Introduction to OSPF
The Open Shortest Path First (OSPF) is an Interior Gateway Protocol used to distribute routing information within a single Autonomous System. It is open standard (RFC2328) It is a Link-state protocol Administrative Distance is 110 Uses cost as metric Fast convergence VLSM support Scalable to large networks Stub capabilities Authentication (None, Clear-text, MD5) Reliability (Sends
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EIGRP tables
Neighbour table Topology table (all possible paths to the destination) Routing Table (Best path) Advertised distance (distance between the local router and the next-hop router) Feasible distance (sum of these ADs costs is referred to as the feasible distance (FD) Successor (Installed in the routing table)
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Introduction to EIGRP
EIGRP is a Cisco proprietary protocol. It has two AD values (Internal – 90, External – 170 ) Fast Convergence. Uses Dual (Diffusing update algorithm). No periodic Updates only triggered updates. Triggered updates only changes occurred. Consumes less bandwidth. Multiple network layer support (IPV4, IPV6). Use of multicast (224.0.0.10) and unicast. Variable-length subnet masking (VLSM)
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RIP Timers
Update: frequency of updates, default 30 seconds. Invalid: seconds since a valid update was seen, to consider the route invalid and placing the route into hold down, default is 180 seconds, in other words six updates. After 180 seconds the route is considered invalid – unreachable (metric is 16). Hold Down: Once in hold down,
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Introduction to RIP
Features of RIPv1 It is a universal protocol. Administrative Distance is 120. Hop count is used as the metric for path selection. The maximum hop count is 15, so it supports maximum 16 routers per interface. Routing updates are broadcast every 30 seconds by default. Because it is a distance vector routing protocol, updates are sent
The Lazy Networker 