Answer / shahin

BGP attributes is a metric used to describe the
characteristics of a BGP paths. Attributes are conatained in
update messages passed between BGP peers for advertise routers.

BGP attributes are broadly divided into two types -

a) Well Known
b) Optional.


Well Known attributes are divided into two types -

a) Mandatory
b) Descretionary

** Mandatory attributes are divided into three types -

a) AS Path
b) Next Hop
c) Origin

** Origin attributes divided into three types -

a) Internal(i)
b) External(e)
c) Incomplete(?)

** Descretionary attributes are divided into two types -

a) Local Preference
b) Atomic Aggregate



Optional attributes are divided into two types -

a) Transitive
b) Non Transitive


** Transitive attributes are divided into two types -

a) Aggregator
b) Community


** Community attributes are divided into for types -

a) No-export
b) No advertise
c) Internet
d) Local AS.

&& Non transitive attributes are divided into three types -

a) MED (Multi Exit Discriminator).
b) Originator
d) Cluster ID.




I'll explain all attributes on next post..!!!

Answer / shahin

Lets start from first... I m gonna explain each attributes
one by one -

Well Known:
Well known attributes are must be recognized by
each compliant of BGP implementations. Well known attributes
are propagated to other neighbors also.

Optional:
Optional attributes are recognized by some
implementation of BGP & expected that not recognized by
everyone. Optional attributes are propagated to their
neighbors based on the meanings.


Mandatory:
Mandatory is BGP well known attributes. Mandatory
attributes are must be present in all update message passed
between BGP peers. It is present in route description.

Discretionary:
Discretionary is BGP well known attributes.
Discretionary attributes are may be present on update message.

AS Path:
AS path is BGP well known mandatory attributes. AS
path defines the list of Autonomous System that a route has
passed through. AS path attributes are used in path
selection process & lowest path attributes will be preferred
over highest one.

Next-Hop:
Next hop is BGP well known mandatory attributes. In
BGP, next hop is the IP address which is used to reach the
advertising BGP router.

For EBGP, next hop is the ip address of the connection
between the peers.

For IBGP, EBGP next hop address is carried into local
autonomous system.

Origin:
Origin is BGP well known mandatory attributes.
Origion attributes define how BGP router learned about the
particular route. Origin attribute have three possible
values i.e. internal (i), External (e) & Incomplete (?).

Internal(i):
BGP learned about the route from Interior
routing protocol.

External(e):
BGP learned about the router from External BGP.

Incomplete(?):
The origin of the route is unknown or learned by
some other way. The origin of incomplete occurs when routes
are redistributed into BGP.



NB:
1. Due to lack of time, rest of attributes I'll discuss on
next post.
2. Its little bit difficult to draw diagram here & explain
each & every attributes.
3. If anyone need more about this, mail me on
mr.shahin07@gmail.com

Thanks & enjoys the weekend party tonight.... hehehe

Answer / jm

BGP attributes are path manipulation features of BGP.There are
many attributes : AS-path, MED, Local preference, Weight, and
Origin code

Answer / srinath

Orgin Code (e) is not learnt via eBGP ( External BGP). it is
a protocol called External Gateway Protocol. This protocol
has been deprecated.

Regards,

Srinath M

Answer / mohammad

http://ccie-bgp.org.ua/158705017x/app01lev1sec1.html

What is the regional Telco office called, where the customers local loop terminates? A.) Demarc B.) DTE C.) DCE D.) CO E.) CPE

1 Answers  

What is a function of a reliable transport layer connection? A. route selection B. acknowledgements C. session checkpoints D. system authentication

2 Answers  

Which three are typical operational phases in a basic connection oriented neloyord service? (Choose three) A. call setup B. data transfer C. load balancing D. call termination E. call priortization F. data segmentation G. data link identification

1 Answers  

Difference between routed and routing protocols not difference between protocol between those.

3 Answers   HCL, TCS,

The following is partial output from a routing table ; '192.168.10.0 [100/1300] via 10.1.0.1, 00:00:23, Ethernet1' Which routing protocol is being used? (assuming defaults have not been changed) A.) OSPF B.) RIP C.) BGP D.) IGRP

1 Answers  

What does the acronym ARP stand for? A.) Address Resolution Phase B.) ARP Resolution Protocol C.) Address Resolution Protocol D.) Address Recall Protocol

2 Answers  

In the setup dialog, what do the square brackets indicate? A. current or default spores B. hard coded values that cannot be modified C. values entered by the administrator but not saved D. values that must be written to NVRAM before becoming enabled

1 Answers  

What must you do to test connectivity on a dial on demand routing (DDR) link? A. increase the idle Import parameter B. send interesting traffic across the link C. reboot one of the integrated services digital network (ISDN) routers D. reset the DDR integrated services digital network (ISDN) router statistics to zero

1 Answers   HCL, IACM,

What is true about Link-State protocols? A.) They maintain a more complex table than distant vector protocols B.) They maintain a less complex table than distant vector protocols C.) They use routing ports D.) The maintain backup copies of the IOS

1 Answers  

How many Devices does OSPF & EIGRP Support

5 Answers   HCL,

Hi,can anyone explain me in brief about ccna security. waiting for your answer

2 Answers  

what are the different symmetric algorithms?

0 Answers   CCIE,