The default-information originate and blackhole
I have read an article :
(((1- The default-information originate OSPF routing process subcommand will generate a default route into the OSPF domain.
2- By default this default cannot be advertised unless the local device actually has a default route installed
in the routing table.
3- This stipulation is added to prevent the case where default reachability is lost from an upstream peer, but default reachability is still advertised into the OSPF domain.
4- An example of this case is as follows.
Suppose that your OSPF domain has two or more connections to an upstream Internet provider. At these exit points from your internal network the border routers are learning a default from the ISP.
5- Additionally these border routers are generating default routes into the OSPF domain by issuing the default-information originate routing process subcommand.
6- Now suppose that one of these connections to the upstream provider is lost. If the border router with the lost upstream connection is still advertising default reachability into the OSPF domain some of the traffic will be blackholed.
7- Instead the router with the
lost connection should withdraw the default route from the OSPF domain, which
in turn would cause all internal devices to reroute out a still valid exit point from the network))).
Regarding to point 6 how does it make a blackhole ?
Because the router still anounces default route into ospf domain, and the packets which prefer this route will be blackholed. because the link to isp is broken. and the router will drop these packets.but the packets those prefer the other default route will go through the second router cause its link to isp is still up.
is it clear?
Similar Messages
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Using the OSPF default-information originate command with two ISPs
I am working for a company that has two Internet circuits with different ISPs at two different locations for redundancy, and both Internet circuits run at different speeds. I'd like to be able to direct the majority (but not all) of the traffic through the ISP with the larger bandwith, but then failover all traffic to one ISP when the other goes down. We're currently using the "default-information originate" command, which fails over OK, but I haven't figured out how to do the load balancing. I'd appreciate your thoughts. Thank you.
One thing that you could consider is advertising the default route as and
external 1 route instead of an external 2 route(cisco default). If you advertise it as an E1
route, all routers will take into consideration the cost associated with the
default route to the router advertising the default route plus the cost of the
default route itself. Whereas if it is an E2 route, the routers just use the
cost associated with the external cost and not the path to get to the router
advertising the default route.
If you made the default route E1, then the routers closest to the advertised
routers will prefer the closest default route and their preference could then be
tweaked by adjusting the interface costs for the default route with a routemap.
By using this method, you could then control which routers use which internet
connection on a per router basis because you could control the cost the internal router
sees for the path from the internal router to the ASBR advertising the default route. The
path with the lowest cost will be prefered.
router ospf 1
default-information originate metric-type 1 -
Ospf no summary and default information originate
Hi all,
I have very simple question and I would like to have your opinion.
I can inject default route in to a nssa area in two way
- no-summary (to be used in to the NSSA ABR or NSSA ASBR)
-default-information originate (To be used in to the NSSA ABR)
Doubts (alle the below query are referred to a nssa area)
- Case no-summary: what will happen if the nssa abr does not have a default route?
-Case default-information originate: what will happen if the nssa abr does not have a default route?
- When do I have to use no-summary and when default information originate?
-What is the benefit to use the following command area xx nssa no-summary default information originate?
Thanks!!Hi,
have a look at this document:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094a88.shtml#defaultnssa
- no-summary (to be used in to the NSSA ABR or NSSA ASBR)-default-information originate (To be used in to the NSSA ABR or NSSA ASBR)
- Case no-summary: what will happen if the nssa abr does not have a default route?
A (summary) default-route will be injected by the NSSABR; the backbone area is supposed to have detailed routing information.
-Case default-information originate: what will happen if the nssa abr does not have a default route?
A default-route will be injected by the NSSABR; the backbone area is supposed to have detailed routing information.
- When do I have to use no-summary and when default information originate? -What is the benefit to use the following command area xx nssa no-summary default information originate?
The no-summary option defines a NSSA totally stub; the NSSABR doesn't translate Backbone Area's LSAs (more precisely: their corresponding routing-table entries) into NSSA summary-LSAs, instead it injects a (summary) default route. If you want the NSSABR to do the summary-translation and also inject a default-route, you can use the default-information-originate option. A NSSABR the will inject a type-7 LSA for the default-route, which is not translated to type-5. This option can also be used on a NSSA ASBR, but in this case a non-OSPF default-route is required and a type-5 translation is possible.
[EDIT] :
Perhaps this discussion is also helpful to understand some of the design aspects of different area types:
https://supportforums.cisco.com/message/3977926#3977926
HTH
Rolf -
OSPFv3 AF NSSA default-information-originate
Hi,
I'm having trouble injecting a default route into OSPFv3 AF NSSA using this config:
router ospfv3 1520
auto-cost reference-bandwidth 100000
address-family ipv6 unicast vrf CUST-1
redistribute connected route-map SET-TAG-LOCAL
router-id 100.64.20.9
capability vrf-lite
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exit-address-family
ipv6 route vrf CUST-1 ::/0 2A01:79A0:3000:F8BB::5
The default route does not get injected into the database. I have to clear the process for this VRF for it to appear in the database:
ROUTER# sh ospfv3 ipv6 vrf CUST-1 dat | in ::|Type-7
Type-7 AS External Link States (Area 1520)
100.64.20.9 632 0x80000004 2A01:79A0:3000:F8BB::/125
ROUTER#clear ospfv3 ipv6 vrf CUST-1 process
Reset selected OSPFv3 processes? [no]: yes
ROUTER# sh ospfv3 ipv6 vrf I-ST-INSIDE-1 dat | in ::|Type-7
Type-7 AS External Link States (Area 1520)
100.64.20.9 1 0x80000001 ::/0
100.64.20.9 1 0x80000001 2A01:79A0:3000:F8BB::/125
ROUTER#
Any help is greatly appreciated.
Thanks.
/JZHi,
A quick check of the config guide shows that their examples of default origination in OSPFv3 use the 'default information-originate' command, this can be tied in with a route-map, in order to match a certain condition. i.e. statement is configured under the process, not using the 'area' command.
1. create prefix -list matching routes (these form the matching condition)
2. create a route-map - with a permit statement matching the prefix-list.
3. default information-originate route-map [map name]
HTH
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> how to change the Default login script and the USER login script in
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Date: Thu, 8 Jul 2010 00:09:53 -0600
From: [email protected]
To: [email protected]
Subject: Illustrator CS5 Not the Default for EPS and other Vector Formats
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Hi,
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