Tag: Layer3

Home Layer3

01

Apr2014

What is Open Shortest Path First, OSPF?

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Open Shortest Path First (OSPF) is link-state protocol that uses the Djikstra Algorithm to determine a shortest path tree.  The OSPF algorithm uses cost defined on links to determine the best path to a network.  For OSPF to remain loop free, each and every router needs to know of all ... Read More
April 1, 2014Praveen Bahethi

31

Mar2014

What is DHCP Relay/ IP-Helper-Address?

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Dynamic Host Configuration Protocol (DHCP) relay is used to forward DHCP client's broadcast request, DHCPDiscover, from one VLAN to the DHCP server's VLAN.  This request forwarding is done by the local router gateway of the DHCP client. The broadcast is not forwarded by routers, but configured with DHCP relay, the ... Read More
March 31, 2014Praveen Bahethi

30

Mar2014

Configuring DHCP relay on Comware

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Dynamic Host Configuration Protocol (DHCP) relay on Comware is configured with concept of multiple DHCP servers and applied to the interfaces.  This configuration allows for added information to allow scale, but is ungainly when you have one or two DHCP servers. In the end, the configuration requirements are straight forward ... Read More
March 30, 2014Praveen Bahethi

30

Mar2014

What is Virtual Router Redundancy Protocol (VRRP)?

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Virtual Router Redundancy Protocol (VRRP)  allows for a group or routers to appear as a single default gateway to end devices.  All the routers must have interfaces that belong in the same subnet.   The end devices point their default gateways to a Virtual Router IP (VIP) address. VRRP is an open ... Read More
March 30, 2014Praveen Bahethi