Category Archives: Routing Protocols

BGP Route-Reflector Design

Posted on January 1, 2020 by Mrityunjay Singh

A route learned by one ibgp peer won’t be advertised to another ibgp peer. This is called BGP split horizon rule. This rule is used to avoid loop in ibgp cases. To mitigate this, we have following option by which … Continue reading →

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Types of Address resolution Protocol(ARP)

Posted on March 7, 2019 by Mrityunjay Singh

Topology Address resolution Protocol is used to find the Layer 2( mac address) information when the layer 3(IP) Information is already given. Total 9 filed in Header. The typical Address resolution protocol Header format is shown as below Fig1 ARP_Header

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Different Static Route Options

Posted on March 3, 2019 by Mrityunjay Singh

In this scenario router IOU1 already know the outgoing interface as we configured the ip route specifying the outgoing interface. So here IOU1 wil check the routing table and will get the outgoing interface detail in single lookup.

Since the network is Ethernet, the IOU1 must know the L2 address, so it will construct ARP packet having source IP address of PC1 and destination of 30.30.30.2. Source mac of IOU e0/1 interface and DMAC as 0.0.0.0. Continue reading →

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BGP Weight Attribute

Posted on September 11, 2017 by Mrityunjay Singh

Topology Objectives Use BGP attribute to influence the route selection in BGP. Currently Router R1/R1 running iBGP .Between R1-R3 & R2-R4 ebgp is used. Within ISP we have used Full iBGP mesh ( of course we could have used RR).Connect … Continue reading →

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BGP Initialization

Posted on September 10, 2017 by Mrityunjay Singh

Topology Objectives Objective is to understand how bgp initialize when you enable interfaces and bgp parameters. We will check it by sniffing tool Wireshark to know what happening behind the scene.  Wireshark will be enabled on f0/0 on R2.

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BGP Over GRE

Posted on September 10, 2017 by Mrityunjay Singh

Topology Objective: To implement BGP over GRE , the topology shown above. In topology R1 & R3 running BGP 100 whereas R2 running only IGP.R1-R4 & R3-R5 running ebgp and advertising prefix 4.4.4.4 and 5.5.5.5 respectively. R1-R2-R3 running ospf under … Continue reading →

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