Tag Archives: Routing table

ip-routing: static routes to an interface instead of next-hop-addresses

Hi! Today I will have a look to a phenomenon that some people of you might already have experienced but werent able to explain it why it works. Its the feature proxy arp that comes into play when you have … Continue reading

Posted in CCIE, Routing | Tagged , , , , , , , , , , , | 22 Comments

REMINDER: administrative distances of routing protocols

ADs of the routing protocols: 0 – connected 1 – static 5 – eigrp summary 20 – ebgp 90 – eigrp 100 – igrp 115 – is-is 110 – ospf 120 – rip 140 – egp 160 – on demand … Continue reading

Posted in Reminders | Tagged , , , , , , , | 3 Comments

bgp race condition problem

Hello everybody! Today I am going to show a phenomenon that is called bgp race condition. Topology is quite simple, we have two routers that are directly connected and they will form an eBGP neighbor relationship that is sourced by … Continue reading

Posted in BGP | Tagged , , , , , , , , , , , | 4 Comments

ip pim autorp – automatic election of an rp in a sparse-mode network

Hello everybody! Today I am going to show and to train for myself how to configure cisco auto-rp for electing rendesovus-points within a sparse mode multicast environemnt dynamically. First of all some short theoretics, as the complete theory can be … Continue reading

Posted in Multicast | Tagged , , , , , , , , , , , , , , , | 2 Comments

pim sparse mode – rp on a stick

Hi everybody! Very often without knowing it in PIM sparse networks we encounter the situation that the RP of a network is a RP on a stick. Take a look at the drawing to get a better understanding of the … Continue reading

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ip multicast (pim sparse mode) over gre tunnels

Hey everyone, today I am going to show how the usage of GRE tunnels in combination with multicast (PIM sparse mode) works. So here is the challenge and our topology: What we have: – we have 4 routers. – each … Continue reading

Posted in Multicast | Tagged , , , , , , , | 3 Comments

pim sparse mode: pim register / pim spt switchover process

Hi everybody! Did a reveiw of the PIM register and PIM SPT switchover process. Here is what I wrote down. If you see any mistakes I made, feel free to comment! Nobody is perfect. 1st step: Registration of a source … Continue reading

Posted in Multicast | Tagged , , , , , , , , , , , , , , | 5 Comments