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Gearing Up For Cisco exam # 642-661configuring BGP on cisco routers
I am preparing for the CISCO BGP exam # 642-661. I have read " Internet Architectures" by Sam Halabi. I must say it is a very good book. I have also read the BGP part in " Routing TCP/IP" Vol II by Jeff Doyle and Caroll. Hope to get registration for the exam in a couple of day for the next 1-2 days.
I started reading the bgp part in Routing TCP/IP, CCIE professional Development book. After that i read the " Internet Architectures" by Sam Halabi. I have been working extensively at BGP on my job so i have a good idea about it. So recently like 2 days ago i picked up a brian dump from my friend and i am trying to equip my self against the tricking language and the tricky presentation of the questions in the exam.
ReplyDeleteBGP route selection criteria that i could not memorize so i created a short cut for myself.
ReplyDeleteN - Ignore route with inaccessible next hop
W - Prefer more weight
L - Prefer high Local Preference
L - Prefer locally originated routes.
A - Prefer shortest AS path
O - Prefier lowest Origin code
M - prefer lowest med
E - prefer EBGP routes over IBGP
C - Prefer route reachable via closest neighbor
R - Router ID is the tie breaker
SO the key to BGP Router Selection criteria is:
NWLLAOMECR
Happy BGP:)
Alas, Passed the CCIP BGP exam on 1st december 2010. Easy exam but there is a lot to BGP than this exam. So i plan to keep reading Internet Architecture by Sam Halabi.
ReplyDelete