Archive for 'IGP Routing' Category
The study of the command eigrp stub and the parameters
Experimental objective: Validate the functions of the command eigrp stub in hub-spoke link, as well as the differences after adding different parameters.
Initial configuration:
R1
interface Ethernet0/0
ip address 10.1.1.1 255.2...
simple layer 3 next hop forwarding
to forward a certain destination address over another
next hop use the following:
access-list 101 permit ip any host 192.168.1.2
route-map layer3 permit 10
match ip address 101
set ip next-hop 192.168.1.3
and in glo...
Route summarization
Routing protocols summarize networks into supernetworks to keep routing tables small.
Rip does this by default and you can’t turn it off.
EIGRP does this also by default. But you can turn it of with “no auto-summaryâ€
redistribution eigrp -> ospf
router ospf 1
redistribute eigrp [eigrp process id] metric [value] [subnets]
for example
redistribute eigrp 1 metric 1 subnets
The subnets variable is responsible for redistributing subnetted networks. Without this variable, o...
redistribution and metrics
With redistribution it is necessary to take care of metrics from different routing protocols.
RIP uses Hop count
EIGRP uses a composition of bandwidth and delay
OSPF uses bandwidth
BGP consists of an arbitrary unit number
...
private IP address ranges (RFC1918)
These are private IP address range as described in RFC 1918. They are not routed on the internet and they are for private or internal use only.
10.0.0.0 - 10.255.255.255 Â Â Â Â Â Â or 10.0.0.0/8
172.16.0.0 - 172.31.255.2...
metric, a definition
Routing protocols need to determin the best way to reach a certain address. So in the case there is more than one possibility, the routing algorithm looks up a metric value. The differnent routing protocols have different metrics. They can also combin...
ip address classes
Class A: 0.0.0.0 - 127.255.255.255
Class B: 128.0.0.0 - 191.255.255.255
Class C: 192.0.0.0 - 223.255.255.255
Class D: 224.0.0.0 - 239.255.255.255
Class E: 240.0.0.0 - 255.255.255.255
distribute-list
With the distribute-list command you can control what kind of updates go into other routing tables. What is injected into the routing table and what does stay just there waiting.
Here is a short example. If you don’t want network 192.168....
Automatic Route Summarisation
The following Routing Protocols do automatic route summarisation by default:
EIGRP
IGRP
RIP v1