LSAs in link state protocols

Lets say we have a stable network and we are using a link-state routing protocol. Then something fails. Will the routers reflood ALL LSAs when one LSA changes or only refloods the changed LSAs?

Francisco
Only the LSA's that have changed will be advetised out. That is one of the big advantages of OSPF in that only affected links are advertised rather than the entire OSPF database.
Jon

Similar Messages

Link-state protocol on blade switches

Hi,
Can anyone confirm is after an uplink is reestablished the down stream interfaces are automatically restored when using link-state protocol?
The documentation states the downstream ports in a group are put in error disable state but doesn't say if they are automatcally made up when the upstream interface comes back up. This refers to Cisco blade 3020 switches running 12.2.25
http://www.cisco.com/c/en/us/td/docs/switches/blades/3020/software/release/12-2_55_se/configuration/guide/3020_scg/swethchl.html#wp1346176
Thanks
Ken

Link state tracking, also known as trunk failover, provides Layer 2 redundancy in the network when used in conjunction with server network interface card (NIC) adapter teaming. Link-state tracking is used to mirror the state of the ports that carry upstream traffic from connected hosts and servers, and to allow the failover of the server traffic to an operational link on another Cisco Ethernet switch. Check out the following link for more information on link state tracking :
http://www.cisco.com/en/US/products/ps6406/products_configuration_guide_chapter09186a00805a75e0.html#wp1285238
Hope this helps.

Routing loop avoidance in Link State

"The link state method is not susceptible to routing loops which is an advantage over the distance vector method" Why? How it avoid routing loop?

Link-state protocols like OSPF use reliable flooding mechanisms to ensure that all routers are acting on the basis of the same information. Loops occur when routers act on the basis of inaccurate or old information. That is what link-state protocols avoid. All routers in a link-state database have the same view of the network.
Paresh

Link State Routing Protocol Question

"In LSP, one router in each area is designated as the authoritative source of routing information (called a designated router). Each area router receives updates from the designated router" Why need designated router? How it work? Why can?t it just broadcast LSP and leant the routing information without the need of designated router? Is designate router the same as backbone or root area in OSPF? Is "area" concept only be used in Link State Routing Protocol OSPF?

hi...
you will find area topology in IS IS also...
here we are using the Area as well as DR and BDR for reducing the LSA flooding in the area... each router in ospf area will send update to the DR on multicast address and then DR will send the multicast update to all other router in the area... here each and every router in the area have the full adjucancy with DR but they are not in the full adjucancy with any other router ...
hope this will help you
rate this post if it helps
regards
Devang

Full routing table exchange in Link State Routing?

In link state routing protocols, full update that happen every 30 minutes, does the routers exchange the whole routing table with each other? Or exchange something else, not full routing table. If not the whole routing table, what they are exchanged?

The interval depends on the routing table. OSPF will send out a fresh copy of the LSA (link-state advertisement) every 30 minutes. ISIS will send it every 20 minutes. Only LSAs are sent, not the routing table.
Paresh

More than one style for a single link state?

RH 8 outputting CHM
Hello,
Is it possible to define more than one style for a single link state?
For example, I would like a link in the footer of my master page to be smaller than the links that appear in the body of my topics. I want to retain behavior, and simply change the point size.
I can't simply hand format in Design mode, because my link is within a script. Or, am I missing something easy here?
Thanks much.

I'm pleased to say I figured out how to change the formatting of a hyperlink embedded within a script.
Within the script, I used a var string to reproduce the text in my link. Then I used another var to change the string size.
So, here's the part of my script that produces what I'm after:
var mailDisplay = 'Was this information helpful? ';
var str = 'Was this information helpful?';
var mailDisplay = str.fontsize("1");
Upon generation of the CHM, the script trumps the CSS. It's a beautiful thing.

How to restore visited link state to unvisited

Hi all -
I have a pseudoclass which nicely shows a gray background
after being
visited.
After clicking in ie6 browser, the links remain gray forever!
I am unable to view in the pre-visited state to show a client
sitting next
to me.
I am viewing on my local machine
There are no cookies being set
Flushing cache doesn't do it
Closing browser doesn't do it
Even rebooting the machine doesn't do it
I guess my question is, "where is my WinXP machine
remembering the visited
state?"
Anybody know this one? Many thanks
CSS follows
a.inactive
{border: 1px solid #000000;color: #000000;text-decoration:
none;padding: 4px
7px
a.inactive:visited
{border-color: #000000; text-decoration: none;background:
#CCCCCC; color:
#000
a.inactive:hover
{border-color: #000000; text-decoration: none;background:
#B30000; color:
#fff

A: How to restore visited link state to unvisited

Michael
Many thanks for the browser information and for polishing the
CSS
It is indeed appreciated.
"Michael Fesser" <[email protected]> wrote in message
news:[email protected]..
> .oO(Ken Binney)
>
>>I have a pseudoclass which nicely shows a gray
background after being
>>visited.
>>After clicking in ie6 browser, the links remain gray
forever!
>>I am unable to view in the pre-visited state to show
a client sitting next
>>to me.
>>
>>I am viewing on my local machine
>>There are no cookies being set
>>Flushing cache doesn't do it
>>Closing browser doesn't do it
>>Even rebooting the machine doesn't do it
>
> Clear the browser history.
>
>>I guess my question is, "where is my WinXP machine
remembering the visited
>>state?"
>>Anybody know this one? Many thanks
>>
>>CSS follows
>>
>>a.inactive
>>{border: 1px solid #000000;color:
#000000;text-decoration: none;padding:
>>4px
>>7px
>>}
>>a.inactive:visited
>>{border-color: #000000; text-decoration:
none;background: #CCCCCC; color:
>>#000
>>}
>>a.inactive:hover
>>{border-color: #000000; text-decoration:
none;background: #B30000; color:
>>#fff
>>}
>
> A bit shorter:
>
> a.inactive {border: 1px solid #000; color: #000;
text-decoration: none;
> padding: 4px 7px}
> a.inactive:visited {background: #CCC}
> a.inactive:hover {background: #B30000; color: #FFF}
>
> should do the same.
>
> Micha

Is there a way to link state buttons?

Hi, I'd like to know if there's a way to link state buttons to activate their hover state together. For instance, when the link 'Pioneers of Design' is hovered over it turns red and links to another page. The yellow image loses the 25% white opaque screen on it when it's in hover state and also links to the same page. Both are in separate state buttons. Is there a way to link the two so that when I hover over the image the screen disappears but also turns the pioneers link red at the same time and vice versa when hovering over the pioneers link? I know both can be put into a state button together but that means that the massive space in between the image and text would create the hover state as apposed to only occurring when hovering over one or the other. Also, I don't know what would happen to this because the text links stay fixed when scrolling and the image links do not. Is there a way to do what I'm talking about? Thanks.
I have the latest version of Muse CC 2014

There's no built-in way to do disjointed rollovers, but if you look it up on the web, you should be able to understand how the respective CSS rules work and implement them as custom HTML or after publishing the site.
Mylenium

Optimize report script having many Link statements

Hi,
I have a report script in Essbase which uses around 10 <Link statements to extract level 1 entity members from decendants of specific entity members and around 8 <Link statements to extract level 0 account members from decendants of specific account members. I observed that this report script takes almost 10 to 12 hours to execute. After some investigation I found out that ideally a report script should have maximum 5 <Link statements defined; in case if there are more than 5 <Link statements the report script would run very slow.
Following is excerpt from my report script:
<PAGE ("Scenario", "Year")
<ROW("Entity", "Account", "Custom1", "Custom2")
<COLUMN("Period")
For Entity:
<LINK((<LEV("Entity","Lev1,Entity")) AND (<IDESC("Ent001")))
<LINK((<LEV("Entity","Lev1,Entity")) AND (<IDESC("Ent002")))
<LINK((<LEV("Entity","Lev1,Entity")) AND (<IDESC("Ent003")))
For Account:
Link ((<LEV("Account", "Lev0,Account")) AND (<IDESC("Acc001")))
Link ((<LEV("Account", "Lev0,Account")) AND (<IDESC("Acc002")))
Link ((<LEV("Account", "Lev0,Account")) AND (<IDESC("Acc003")))
Could you please help me to fine tune/optimize this report script and suggest an alternate way to write this script without <Link statements so that I could run this report script faster?
Thanks in advance!
AK

You state 10 but show six. Which is it?
As for performance, if you make it just one Entity dimension LINK statement, is it fast?
Following on that, have you tried breaking the report into multiple report scripts? If they are individually faster, you could just concatenate the output files through an OS batch script. The thought of 10 individual report scripts (although I suppose we are potentially talking about more than that but I can't tell based on the information you've provided) could be complicated, but it might be worthwhile from a prototyping perspective.
Have you tried joining them together with a "!" statement. <--What that means is you write a report script and terminate it with a !. Then write another, similar report script and stick a ! on it. And again, and again, etc. Essbase reads to the ! and then goes to the next report script.
Regards,
Cameron Lackpour

Link State Tracking in Cisco ASA

Dear ASA Guru,
Is there any feature like Link State Tracking in Catalyst for Cisco ASA. I want to shutdown another interface if one interface is down in Cisco ASA.
Best Regards,
Rizal Ferdiyan

AFAIK - this is not an available feature.
HTH>

LACP or Link State Tracking over VPLS?

Hi all!
I have 2 sites connected with VPLS. Both sites are now having a 2nd VPLS circuit installed (with a different carrier) for redundancy/failover. I've got a Catalyst 3750 at each end to work with.
My question: what's the best way to configure the 3750's? I was thinking either LACP with 2 physical interfaces (one for each VPLS line) - in which case traffic would be balanced across them, which is fine.
OR I could use Link State Tracking, such that if 1 link fails it would failover. Though I'm new to Link State Tracking so I don't know if this would actually work over VPLS.
Your thoughts are very appreciated.

Link state tracking, also known as trunk failover, provides Layer 2 redundancy in the network when used in conjunction with server network interface card (NIC) adapter teaming. Link-state tracking is used to mirror the state of the ports that carry upstream traffic from connected hosts and servers, and to allow the failover of the server traffic to an operational link on another Cisco Ethernet switch. Check out the following link for more information on link state tracking :
http://www.cisco.com/en/US/products/ps6406/products_configuration_guide_chapter09186a00805a75e0.html#wp1285238
Hope this helps.

VIF link state down

Hi
When I configured service profile to a blade then deploy ESXi, It works correctly for a time then I found the following error " VIF 716 link state is down" as in the attached and the server management IP is pingable also the ESXi IP is pingable during the error
I did the Same to another blade but no problem

Hi Amr
This has been discussed many times before
see eg. https://communities.vmware.com/message/2183957
But about the HW failover configuration I really do not know why not recommended to use the HW failover I think it's better than failover of VMware VSS
Agreed that it should work, but I'd prefer to enable and configure failover behavior in ESXi rather than UCS. In my research on this issue, I found a thread over on the Cisco UCS forum that has a clear statement regarding this configuration: https://supportforums.cisco.com/thread/2187653.
"Never use fabric failover with a hypervisor vswitch. Let the failover mechanism of the vSwitch handle the network outage."
So while it may be a valid design, it looks like the consensus is to let your vSwitch handle the failover.
Cheers
Walter.

Link-State Tracking?

Attached is a diagram of my fabric I will be deploying (data center environment). The access switches are 2960G (24port), and the distribution switches are 2960G (48port). A total of 18 access switches will be used.
I will be using Rapid PVST+ throughout the fabric. With that in mind, is it necessary to implement link-state tracking on the access switches as well? I am having difficulty finding out if Cisco recommends link-state tracking for performance improvment, or if it is absolutely necessary in my environment.
What exactly are the pros/cons of enabling link-state tracking on my access switches?
Thanks,

Link-state tracking on 3550

Hi,
I would like to know if the link-state tracking is supported on the 3550. If yes then please let me know on which IOS version. I was not able to check this on the IOS features.
Second question:
Can I trak on sub-interface (VLAN) instead of the full interface?

Hi Amin
I checked out for the same and it says its supported in Cisco 3550 but regarding the exact ios code you better can choose the required version from the feature navigator.
http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp
regds

Error 734: The PPP link control protocol was terminated.

I am using windows 8.1 and www.astrill.com VPN. before it was working, but now its not working. I tried to connect VPN for last 4 days.
I followed https://social.technet.microsoft.com/Forums/windows/en-US/303c7c61-074f-4588-ba92-006295ef7cc8/error-734-the-ppp-link-control-protocol-was-terminated?forum=w8itpronetworking but it doesn't help me.
I guess I couldn't login astrill vpn. because my OS doesn't ask me login username password. only asking about my computer's username password. Before it was working same my laptop and OS. I think after windows update it doesn't work.

Check the properties under your Astrill VPN profile, under security tav click "Allow unsecured password" in the "Validate my identity as follows" box, and then click "OK
or try to delete and re-create the profile
http://wiki.astrill.com/index.php/Astrill_Setup_Manual:How_to_configure_PPTP_with_Windows_built-in_client_on_Windows_8
try to update MS-CHAP (authentication protocol) support on the VPN server by download the latest version
https://www.astrill.com/download.php
You can also try to use Astrill VPN Dialer 1.1 to connect
you can also try do system restore (using restore point) back to condition when this VPN working fine
contact Astrill as VPN manufactured for better investigation
Tips:
Hongkong server 1 or 2 and Los Angles mostly working
Mostly issue will be solved by reinstall Astrill
Update your Wlan and LAN card to isolate driver issue (if any), check at your PC manufactured site

LSAs in link state protocols

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