CCNA Explorer semester 2 kapitel 11 - Revision history

Heth at 04:46, 4 April 2011

2011-04-04T04:46:13Z

Rael: /* Fine-tuning OSPF= */

2010-10-21T12:53:48Z

‎Fine-tuning OSPF=

Heth: /* Reference bandwidth */

2010-04-18T10:07:29Z

‎Reference bandwidth

Heth: /* OSPF redistribute OSPF default Route */

2010-04-18T07:49:02Z

‎OSPF redistribute OSPF default Route

Heth: /* DR og BDR selection example */

2010-04-18T07:44:56Z

‎DR og BDR selection example

Heth: /* DR og BDR selection process */

2010-04-18T07:39:56Z

‎DR og BDR selection process

Heth at 07:34, 18 April 2010

2010-04-18T07:34:00Z

Heth at 07:00, 18 April 2010

2010-04-18T07:00:56Z

Heth at 06:35, 18 April 2010

2010-04-18T06:35:48Z

Heth: New page: TOC {| |OSPF udviklings tidslinie |- |Encapsulated OSPF Message |} = O...

2010-04-18T06:21:22Z

New page: __TOC__ {| |800px|left|thumb|OSPF udviklings tidslinie |- |800px|left|thumb|Encapsulated OSPF Message |} = O...

New page

__TOC__
{|
|[[Image:Ccna explorer 2 chap 11 1.gif|800px|left|thumb|OSPF udviklings tidslinie]]
|-
|[[Image:Ccna explorer 2 chap 11 2.gif|800px|left|thumb|Encapsulated OSPF Message]]
|}
= OSPF Pakketyper =
{|
|[[Image:Ccna explorer 2 chap 11 3.gif|800px|left|thumb|OSPF pakke typer]]
|}
'''1. Hello''' - Hello packets are used to establish and maintain adjacency with other OSPF routers. The hello protocol is discussed in detail in the next topic.

'''2. DBD''' - The Database Description (DBD) packet contains an abbreviated list of the sending router's link-state database and is used by receiving routers to check against the local link-state database.

'''3. LSR''' - Receiving routers can then request more information about any entry in the DBD by sending a Link-State Request (LSR).

'''4. LSU''' - Link-State Update (LSU) packets are used to reply to LSRs as well as to announce new information. LSUs contain seven different types of Link-State Advertisements (LSAs). LSUs and LSAs are briefly discussed in a later topic.

'''5. LSAck''' - When an LSU is received, the router sends a Link-State Acknowledgement (LSAck) to confirm receipt of the LSU.
= HELLO protocol =
{|
|[[Image:Ccna explorer 2 chap 11 4.gif|800px|left|thumb|OSPF Message Format]]
|}
*'''Type:''' OSPF Packet Type: Hello (1), DD (2), LS Request (3), LS Update (4), LS ACK (5)
*'''Router ID:''' ID of the originating router
*'''Area ID:''' area from which the packet originated
*'''Network Mask:''' Subnet mask associated with the sending interface
*'''Hello Interval:''' number of seconds between the sending router's hellos
*'''Router Priority:''' Used in DR/BDR election (discussed later)
*'''Designated Router (DR):''' Router ID of the DR, if any
*'''Backup Designated Router (BDR):''' Router ID of the BDR, if any
*'''List of Neighbors:''' lists the OSPF Router ID of the neighboring router(s)
{|
|[[Image:Ccna explorer 2 chap 11 5.gif|800px|left|thumb|HELLO protocol]]
|}
== Mismatch OSPF timere ==
Hvis HELLO interval og DEAD interval ikke er ens på naboerne kan der ikke laves et ''adjacencie''.

[[Category:CCNA]]

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-__TOC__
+{{TOCright}}
 {|
 |[[Image:Ccna explorer 2 chap 11 1.gif|800px|left|thumb|OSPF udviklings tidslinie]]

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 |}
-=Fine-tuning OSPF==
+=Fine-tuning OSPF=
 ==Reference bandwidth==
 {|

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 |}
-=Reference bandwidth=
+=Fine-tuning OSPF==
 {|
 |[[Image:Ccna explorer 2 chap 11 48.gif|800px|left|thumb|Netværk med internet adgang]]
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 |}
 [[Category:CCNA]]

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 |-
 |[[Image:Ccna explorer 2 chap 11 43.gif|800px|left|thumb|Forcing election]]
 |-

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 |[[Image:Ccna explorer 2 chap 11 39.gif|800px|left|thumb|show ip ospf interface]]
 |-
-|[[Image:Ccna explorer 2 chap 11 35.gif|800px|left|thumb|Alle skal sende LSA'er til alle (Problem)]]
+|}
 |-
-|[[Image:Ccna explorer 2 chap 11 36.gif|800px|left|thumb|DR og BDR]]
+|[[Image:Ccna explorer 2 chap 11 43.gif|800px|left|thumb|Forcing election]]
 |-
 |}
 [[Category:CCNA]]

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 |-
 |[[Image:Ccna explorer 2 chap 11 23.gif|800px|left|thumb|R3]]
 |-
 |}
 [[Category:CCNA]]

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 # If the router-id is not configured, the router chooses highest IP address of any of its loopback interfaces.
 # If no loopback interfaces are configured, the router chooses highest active IP address of any of its physical interfaces.
+{|
 [[Category:CCNA]]

@@ Line 37: / Line 37: @@
 Hvis HELLO interval og DEAD interval ikke er ens på naboerne kan der ikke laves et ''adjacencie''.
+= Link State Updates =
 [[Category:CCNA]]