Friday, November 14, 2008

hai all .. had a bad i net connection so couldnt upload any thing from the labbing part for yesterday .... i dont know when my i net flaps off .. so let me quickly spend my time here ... before gng on to the labs with ospf (2 labs) i will let you know what i had done last ...

it's the IS-IS protocol ...

the protocol is real simple and easy to configure ...

i had seen cb.t and train.signal and both of them had different points to offer ... over all is is is really simple and piece of cake to configure ...

the terminology is quite different ..but overall the id system and the routing proc is similar to ospf ...

only one bit to explain that is the net id

net id is similar to router id in ospf .. to understand primarily.. the point to remember while configuring net id is simple

net id has --- 3 fields

first field -- type of device -- always 00 for a router so .. as in this case in cisco systems it will be 00 ... ios alerts when wrongly configured ..

second field is ---- system id --- 6 bits or 12 digits --better to have a similar number or mac number upto you -- let us say for r4 : 4444:4444:4444

third field is the area id ----remember two things for exam purpose : 49 and 4 digits ----

49 -- significance of 49 is that it is like a private address in this osi model

and four digits ... simple way ..if you have area 1 --- name it as 0001

four digits are compulsory .. similarly for area 20 --- 0020

so ...

here is the way you write net address

net addr = third field : second field : first field

ie a sample for a router r1 in area 2 is as follows


and some of the clns commands ..

show clns neig

show clns neig detail

to start the process : r1(config)#router isis ------------------- this is not supported by all of the ios images .. even i had a 3660 image not supporting this

r1(router-config)#net 49.0002.4444.4444.4444.00

*do not forget to turn is-is on interface also

int s2/0
ip router isis

some comparisions ..

there are three types of routers / (router = integrated system)

l1 ---------------------- intra area router in ospf

l2 --------------------- backbone router in area 0 for ospf

l1/l2 ------------------ abr in ospf ----------------------------summaraisation in isis must and should be done on l1/l2 router

this is it i had learned ... back to the labs in ospf

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