Notes help on CCNP BSCI

certmagnet

Does anyone have any CCNP BSCI 642-801 notes they wouldn't mind sharing. I'm reading the Cisco Press book but would also love to use any notes that are available as well to be sure I'm prepared and ready!

I did look over the EIGRP section on this site which was great!

Thanks!!

thisisalex02

i think im the only one that can understand the notes i take...

pizzafart

BSCI

OSPF
----

Packet acronym HDLLL
RUA!

LSU's, LSacks, LSR's

I think LSU's contain multiple LSA's
types of LSA's

1. Router RLA links, state of links, costs
2. Network LSA DR's send info about all LAN/meshed routers
3. Network summary SLA Intra area routes
4. ASBR summary lsa Route to ASBR (to other areas)
5. AS external LSA External or default routes, <- sent by ASBR's

7. NNSA external LSA Like a type 5, but through a NSSA

stubby blocks type 4 & 5, creates default type 3
totally stubby blocks type 4 & 5, AND all type 3's, also creates a default type 3

not so stubby blocks 4 and 5, creates default type 3, and allows ASBR to send 7's

10 second hellos by default

neighbor states:
down>attempt(NBMA only)>Init>2way>Exstart(highest router ID is master)
>Exchange>Loading>Full

#show ip ospf neighbor
#show ip ospf interface
>int>#ip ospf priority
>int>#ip ospf cost (1 - 65535)


#show ip ospf

int>#ip ospf network {broadcast | non-broadcast | point-to-point | point-to-multipoint}
^^neighbors ^^neighbors


only point to multipoint and non-broadcast are RFC compliant

router>#neighbor /ip-address priority /value

Higher priority = DR/BDR election candidates

224.0.0.5 AllSPFRouters
224.0.0.6 AllDRouters

IP protocol number is 89

default metric is cost. default cost = 10^8/bandwidth

Uses Dijkstra (not Bellman Ford or DUAL)

Hello/dead intervals for different networks:
broadcast 10/40
non-broadcast 30/120
point-to-point 10/40
point to multipoint 30/120

#area /number stub
#area /number stub no-summary
#area /number stub no-summary
#area /number nssa

#area /area range /address /mask
#area /area virtual-link /router-id [tranit area# and router-id of opposing router]

#show ip ospf
#show ip ospf interface
#show ip ospf neighbor [detail] neighbor states [hello intervals, etc]
#show ip ospf database LSA data


#debug ip ospf [packet | hello | adj | events | etc...




ISIS
----

IS-IS multicast addresses: 0180.C200.0014 (AllL1IS)
0180.C200.0015 (AllL2IS)

CSNP,PSNP Sequence number PDU's
Metrics default, delay, expense, error (Cisco only uses default @ 10)
default 0-63, default 10
aggregate path calc max is 1023

DIS designated IS, similar to DR & BDR in OSPF
difference is that neighbors still talk to eachother
5 second csnp broadcasts on broadcast network

Packet acronym: HLS
Hello, LSP (link state packet) lev 1/2, SNP (CSNP/PSNP) lev 1/2

IS, ES-IS, SNPA, LSP (link state pdu), net, lvl 1, 1/2, and 2 routers.

net address format 00.0000.0000.000.00 (standard)
Also, there' OSI NSAP format and GOSIP format.

10 second hellos by default. NOTE.. hello intervals don't have to match in IS-IS


BGP
---

Neighbor State acronym ICAOOE

Idle
Connection TCP established
Active opensent for longer than 5 seconds
OpenSent open packet is sent
OpenConfirm received
Established post processing, updates are now sent freely


Message types
Open version, my AS#, Hold time, Router ID, Optional
Keepalive to keep holdtimer from exipring, 60 sec default... 180sec default hold time
Update withdrawn routes, path attributes (tvl --- see attributes below), IP prefixes reachable
Notification error message; closes down session

RIB Routing information base, split like so:
Adj-RIBs-In
Loc-RIB
Adj-RIBs-Out

Route selection process
1. weight
2. local pref
3. originated the route (0.0.0.0)
4. shortest AS-path
5. Lowest Origin code (igp,egp,incomplete)
6. lowest MED
7. external preferred over internal
8. for internal, closest IGP neighbor
9. for external, prefer oldest path
10. lowers BGP router ID
11. lowest neighbor IP address

Attributes
Origin well mand IGP, EGP or incomplete
AS-Path well mand list of AS paths traversed
Next-Hop well mand ip for next hop into AS
MED optional non-t multiple entrances from outside, lower better
Local Pref well-disc multiple exits from local AS, higher number better
Atomic-Aggregate well-disc (op t can partial) informs that sending router has aggregated route
Aggregator optional t (op t can partial) BGP router-ID & AS# for router that did aggregation
Community optional t tags routes for filtering, route selection
Originator_ID optional non-t
Cluster_list optional non-t


weight? higher is better

IBGP doesn't advertise something it's learned via IBGP to other IBGP peers

#neighbor /name peer-group
#neighbor /ip peer-group /name

#neighbor /ip remote-as /as#
#neighbor [/ip | /peername] shutdown
#neighbor /ip update-source loopback
#neighbor /ip egp-multihop [/ttl] (use with static route)

#neighbor [/ip | /peergroup] next-hop


#network /prefix [mask /mask] advertises routes.. mask requires an exact
must match in the routing table to advertise.
null route can suffice

#clear ip bgp {* | /neigbip} [soft [in | out]]
#clear ip bgp peer-group /name

#show ip bgp
#show ip bgp neighbors
#show ip bgp summary

#debug ip bgp dampening
#debug ip bgp events (neighbor relationships)
#debug ip bgp keepalives
#debug ip bgp updates

#aggregate-address /ip /mask [summary-only] [as-set] summarizes at bgp table instead of ip routing tbl
without summary-only, bgp advertises summarized & individal links

#auto-summary describes how BGP handles redistributed routes *unsual implementation

IGRP
----
interior routers, system routes, exterior route (other AS + sets the gateway of last resort)
bandwidth, delay, load, reliability
classless
configurable metrics, triggered updates, hold-down updates, unequal cost load balancing
90 second update interval
270 second invalid timer (*3)
630 second flush timer (*7)

280 second hold down timer (upon receipt of an unreachable message... *3+10)

24-bit updates

EIGRP

---

RTP, neighbor discovery, DUAL
5 sec hello timer, low speed WANs get 60sec
helo contains k values, AS, EIGRP version, hold time <--- neighbors must be identical
224.0.0.10 multicast

to form neighbor adjacency:
hello > reply > ack

32-bit updates
metric * 256 (as compared to IGRP)

***SIMULATE pg. 137


#ip bandwidth-percent eigrp /as-number /percent
#metric weights /tos /k1 /k2 /k3 /k4 /k5 BDRLM
#distance
#default-metric /B /D /R /L /M for redistribute

>int>#ip hello-interval eigrp /AS# /seconds
>int>#ip hold-time eigrp /AS# /seconds
>int>#ip summary-address eigrp /AS# /address /mask

#show ip eigrp topology
#show ip eigrp interfaces
#show ip eigrp neighbor [detail]
#show ip eigrp traffic
#show ip eigrp events

#log-neighbor-changes

#debug eigrp neighbors
#debug ip eigrp
#debug eigrp packets

routing table, topology table, neighbor table



















CRAPOLA

---

pr



TCP port: 179


attribute type bits:
spg329 ***


*** spg352 create scenario with multihop, trying to show how routers "already know how
to get to eachother"

To do:
IPv6
global unicast 3bit header, 45bit provider (global routing prefix),
16bit site (subnet ID), 64bit host (interface ID)

2000::/3 global unicast prefix
0:0:0:0:0:0:0:1 or ::1 loopback

xxxx.xxxx.xxxx EUI-64 format (extended universal identifier)
FFFE in IPv6, this gets inserted
xxxx.xxFF.FExx.xxxxx <---- thus creating
also, remember to flip high-order bit 7 (u-bit) from 0 to 1
site local unicast

FEC0::/10 sitelocal unicast prefix
address is like this 10 bit header, 38 bits worth of zeros,
16 bit subnet ID, 64 bit interface ID

link local
FE80::/10, 54 bits worth of zero, 64 bit interface ID




link-local unicast

ip4 mapped
ip4 compatible

unspecified




















To memorize:

nat commands

ip route

router protocol stats:
hold timer, default metric, admin distance, hello intervals, update intervals,


rip1/2 30 sec updates, 180 sec invalid, 240 sec flush
uses Bell-Ford

is-is uses dijkstra

ospf uses dijkstra

Admin distances

bgp attribute types (optional, mandatory, etc..)

multicast addresses, (224)

router packet types

access list and prefix list commands

route map commands
policy commands


odr commands

pg. 117 - 120


IPv6
header format
cast types
addressing

IPv4 header format
header format
cast types
addressing


router commands
bgp commands
route reflectors
communities
confederations
route aggregation
show, debug
igrp
ospf
is-is
rip1 rip2

nat
tcp load dist
overloading
overlapping
static\pools

neighbor negotiation processes

show & debug screens for all routing prots

route identifiers: i, D, o, etc..


feb 21st, 1:16pm


270-6900

wildfire

Wow I need my mircoscope! haha,

I thought my notes were a mess, nah only kidding Pizza, my notes are the same, Im sure they make sense to me!

But Certmagnet the best thing is to do exactly what he has done here, I do exactly the same, jot the main points on a paper, its amazing how seeing the words IP protocol 89 prompts you to remeber, then when you see that on the exam you know you noted it!
Also if you can read and decipher these notes then thats a good sign your on the right track!

pizzafart

Yeah that's pretty much how I do it. Actually I've since stopped taking notes altogether because I find that I pretty much end up reading every square inch of the books anyway. For some people the act of writing it down helps memorization. It doesn't help me that much but hey whatever works do it.

Lol yeah I made it tiny because I felt bad making a 30 screen-scroller post. It's the ant farm IOS guide!

Webmaster

I scaled it up a bit to make it a bit more readable. Thanks for sharing, I think it makes a nice checklist!