Cisco WAN :: AS 400 Why That Subnet Is Included In OSPF Configuration
Oct 9, 2011
a link is added between Vail and Telluride in case if one of Aspen links fail to prevent AS 400 to become isolated. This link runs IBGP between both routers. Because this is an iBGP link, both routers will exchange BGP routes freely and automatically enters those routes into the routing table. Anyways, this link is advertised to OSPF through the BGP-to-OSPF redistribution. However, the book included that link in the OSPF configuration because as the book says "Without it, the iBGP session will not form" ... I did't get this part because the link is physical not logical between Vail and Telluride. Before the link was logical and the TCP session was performed through Aspen that's why we needed Aspen to know about this link. But now, it is physical so the iBGP (TCP) session should be formed without including that link in the OSPF config.
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Jun 20, 2012
I am trying to modify the OSPF admin distance for a specific subnet under version 5.1(5) of the Nexus 7K, but this command does not appear to be available.
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Mar 11, 2012
I have a Nexus 7K router, has 2 ospf process, ospf 1 and ospf2. OSPF1 has several subnets in 10.1.0.0/16 subnet range , OSPF2 has several subnets in 10.2.0.0/16 subnet range. I want to summary OSPF 1 subnets to 10.1.0.0/16 then redistribute to OSPF2.but OSPF 2 didn't receive 10.1.0.0/16. Below is the config
ip prefix-list all seq 10 permit 0.0.0.0/0 le 32
route-map all permit 10
match ip address prefix-list all
router ospf 1
router-id 10.10.3.9
[code]....
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Aug 26, 2012
I manage a small/medium sized campus network consisting of 4 Cisco 6500 series chassis (each with SUP720's) and a couple hundred Cisco 3550/3560/2960 edge switches. We recently completed a new leg of fiber that will make a completed loop between all of the 6500's .... before I make the pyhsical connection I need to figure out my OSPF entries on each 6500 switch.
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May 5, 2012
I have a network with static routes witch I need to convert to OSPF.Never used OSPF, and do not have much experience in routing in general.The netvork is connected via some fiber links, but moastly wireless bridges.I have attached a drawing of how the network is.Routers are 3550, 3560 and 3750s.Each router is on a different physical site.
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Sep 5, 2012
I have a /25 block of public ips from my ISP which I'd like to subnet into two /26 blocks. I have a Cisco 2600 with 2 ethernet ports in it. What are the commands I'd need to take my 200.180.200.0 255.255.255.128, gateway 200.180.200.1 and turn it into 200.180.200.0 255.255.255.192, gateway 200.180.200.1 and 200.180.200.64 255.255.255.192, gateway 200.180.200.65? One of the interfaces will be connected to the ISP & the other to a switch, and then we could access the two subnets through the switch.
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Sep 22, 2011
I have 2 ASBR routers, AGFR01RTR03 and AGFR02RTR03, performing OSPF to OSPF redistribution in both ways for the same ***. They also do summarization for our private addressing scheme. It is all working just fine for that part (neighbors, summarization, redistribution).
AGDC01RTR01 --- AGDC02RTR01 (OSPF 1000 ABRs)
| |
| |
AGFR01RTR03 --- AGFR02RTR03 (OSPF 1000 / 53 ASBRs)
Let's focus on AGDC01RTR01 with a specific entry here (IP subnet is fake) :
Routing entry for 1.1.1.0/25
Known via "ospf 1000", distance 110, metric 300, type inter area
Last update from 10.2.244.76 on GigabitEthernet5/1, 1d03h ago
Routing Descriptor Blocks:
* 10.2.244.76, from 10.2.1.249, 1d03h ago, via GigabitEthernet5/1
Route metric is 300, traffic share count is 1
[code]...
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Jan 13, 2013
May I have to know how to check functions included for asa image NCI-ASA5520-BUN-K9?
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Dec 2, 2012
We've ordered a 4500 core switch and 4948 Server Farm switch for our client, but the switch box does not include a IOS image CD or anything related to IOS image and now the client is asking us why is this item missing as the IOS
-S45UK9-32-1502SGCAT4500e SUP7e Universal Crypto Image
-S49IPB-12253SGCisco CAT4900 IOS IP BASE W/O CRYPTO
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Mar 14, 2011
Currently the OSPF network consist of 2 segment route via static route.One is AREA 0 and another AREA 10.Both network are seperate entity, only static route to route between 2 networks.But the static route do not provide the dynamically and flexibility, I plan to run routing between 2 networks via VLAN160 and VLAN162.
I still want to manitnace it was 2 different OSPFrouting domain.Can I run OSPF with differrent OSPF porcess ID?
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Dec 10, 2011
Cisco 1941/2911 Fan Blower Assembly is included in router or order separately..?
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Feb 1, 2012
We have recently aquired a remote location which has a pre-existing flat network (172.16.X.X/16). Before we are able to convert them over to our new IP scheme, they have a need to have wireless connectivity on site. We have 4 1142's which I need to configure for them. I have experience configuring WLC's and autonomous AP's for networks with multiple vlans but have never configured AP's for a flat, single subnet network. I need to configure them for either guest access (internet only) or corporate access to network resources with radius authentication. Do I configure a native vlan as I would for a typical multi vlan network? Do I configure the switch port as an access port as opposed to a trunk beacause of the lack of layer 3? I basically need a sample configuration for this situation.
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May 15, 2011
I am running IPv4 with OSPFv2 currently. However, I planed to deploy IPv6 in my network. Is it possible to deploy V6 with OSPFv3 without affecting current network traffic in V4?
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Aug 3, 2012
What I am trying to do is I have one switch with say a 10.1.9.1 sub-net I need to have one of the ports to be trucked with two vlans one for DSL and the other for a local connection with the sub-net of 10.1.5.1 both of the sub-nets are configured in the core as 9 and 5 so I have port 0 set up as a trunk and it is set up as ge-0/0/0.0 vlan_5, vlan_192 on the 10.1.9.1 subnet switch. The DSL is working but the local is not pulling a 10.1.5.1 IP and has no connectivity. Everything looks as if it is configured correctly but still the DSl is working but not the Local connection.
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Aug 29, 2012
why a subnet wouldn't be passed on to just one participating OSPF device?
I have two routers and an ASA, all of which are in area 0, it's a pretty simple config. The two routers are connected to some other devices (also in area 0) that pass of an external route to a particular subnet, let's call it 192.168.4.0. The routers are getting it just fine, but the ASA is not:
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Dec 6, 2012
What if i run ospf in all of the routers in network diagram ? does it caus loops ? if so how to prevent it ?
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Jul 12, 2012
Isn't there a way to increase the TTL of an OSPF Hello packet or am I thinking of a different protocol? Or is it only with virtual links? I can't seem to find it in my ROUTE cert book or on the Intarwebz outside of setting TTL security, but I could have sworn I remembered configuring something like this in my ROUTE lab book that I unfortunately do not have at work.
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Oct 29, 2012
I will be provided with /29 public IP address from my ISP. The idea is to run OSPF between ISP and my ASAs over private IPs so /29 is presented to ASA. This is because I will be using 5 out 6 available IPs on my ASA so I cannot use them on the routers.I need to run HA in Active/Standby mode on ASA, terminate site-to-site and remote access VPNs on ASA, and use static NAT for kit in DMZ network I am trying to figure out how to present this public IP range on ASA. Should I create two subinterfaces on physical interface towards OSPF area and assigned private IP address on one of them for OSPF and public IP on another and then setup a failover on each subinterface.
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Apr 25, 2013
I'm trying to run an OSPF protocol over an ATM connection:
192.168.80.0 |----10.0.0.1-----------10.0.0.2----| 192.168.50.0
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Dec 22, 2012
how would u link(or in other word route) different OSPF process ID? i have OSPF 1 and OSPF 2 and i want them to see each others networks...how can i accomplish this ?
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Feb 11, 2013
implement backup WAN links to complement the metro Ethernet links we currently use so we have some redundancy. These will most likely be a VPN over an Internet service but might be another Ethernet type service, the medium shouldn't really matter I wouldn't think. What I am looking for input on is what is the best way to implement this? Would I just set costs so that the backup is only used when the primary goes down, or should I create new OSPF area for the backup links?
Currently the core switches that are also our routers are 3750G stacks running ip services. We are getting ready to install new firewalls at each location that will become the gateways for the vlans currently on the core switches to give us much more control over segmentation, and because of this I am thinking that it may make sense to then move the OSPF instance from the core to the firewalls. In the drawing I did not show the access layer switches off of the core, and the MOE circuits actually terminate into a 3550-12T switch before the core. I think I will actually eliminate those 3550-12T switches and go straight into the core. This is a current state drawing, so does not include the backup links I am planning.
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Aug 12, 2011
I have 10 different segments in ASA 5520, so i created 10 VLAN in ASA & made the inside interface as Trunk that connects with core switch. Now i need to run OSPF in the ASA.
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May 13, 2013
I am in the datasheets page for Cisco 3560C Compact switch and states that it ships with IP Base image that "includes the support for routed access, MACsec, and Open Shortest Path First (OSPF)"
[URL]
Does this image come with the full fledged OSPF feature or is it a cut-down version of it?
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Dec 19, 2010
I will be getting a WAN connection to a few offices and I have a need to control routes recieved and advertised to/from them. The service provider will be placing a CPE device on-site and will support OSPF with my edge router; in this case a Cisco 2821. That 2821 router will ideally be configured with OSPF routing toward my two core switches.
-> C2821 to NOT have the full routing table from the Core switches
-> Only needs knowledge of two routes from the Core switches and routes from remote offices.
-> Controlled routing advertisements. I do not control the remote offices and would like to ensure they do not accidentally advertise routes into my enviroment that could create a conflict.
I'm assuming the Service Provider will be running BGP on their CPE router, which will mean that the OSPF routes recieved by my Cisco 2821 edge router will be OSPF E2 routes. So if thats the case the 2821 would need to advertise E2 routes.I'm not sure if I should be configuring the 2821 in Area 0...because its meant to be a WAN edge router; but if I configure it in another area...say 200...the Service Provider may configure his CPE router in Area 0...which I'm guessing would pose a problem as the 2821 would be lodged in between two area 0s?
From the reading I've done it sounds like I could use NSSA...but I'm not sure if this is the best design.
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Jan 19, 2013
Looking through the SPROUTE course material they state on several occasions that an ABR will announce a default route in to a standard NSSA area, same as a stub area, because LSA5 external routes are not allowed.
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Jun 27, 2011
I have 3 tunnels established (full mesh) with 3 CISCO ASA (all security+), through Internet : - Site A : ASA5510 - Site B&C : ASA5505, There is no main site or client site, each site has more than one network behind it. So I'd like to setup OSPF between all the ASA for them to exchange their route within the tunnel. I thought this was automatic when establishing the tunnel, but it isn't.
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Feb 26, 2013
When you configure an ABR to inject a summary route into an area, what are the circumstances under which the ABR will inject the summary? I.e., since it's not a set of specific subnets learned directly from other OSPF routers, does the summary get injected regardless of what's in the routing table of the ABR?
I would imagine this could cause problems in a situation where there is an ABR injecting a large summary into an NSSA that also has a backup path over the Internet (IPsec tunnel or something). For example, if the area 0 routers from which the ABR receives routes went down, the ABR would continue to inject the summary route into the NSSA thus tricking those routers into sending traffic to the ABR rather than over the backup link.
I can't imagine any other way an ABR would decide when it's suitable to inject the summary though.
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Jul 1, 2012
I have a simple isp topology built in GNS3, for testing (pppoe) dialers:cisco router(R1) connected to my pc network card, doing NAT translations for all the devices in the topology.I know how to configure NAT for spesific ip range, but i can't find out how to configure NAT for networks which are learned through ospf (or any other dynamic way).
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Sep 24, 2012
I have an AS-external route being redistributed into OSPF from a static route on one of my routers. I recently changed the static route from a /24 to a /26 and all of a sudden the link ID of the segment in the OSPF database went from the network address to the broadcast address: Code:
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Aug 30, 2012
I have 3 routers all running OSPF. each of the three routers have 2 networks they are advertising..NAT Overload breaks OSPF Adjacency
[code]...
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Feb 10, 2013
OK. I think Im going crazy here. Im studying OSPF and I'm working on the DR/BDR election process. I have a topology where three devices (RIDs 1.1.1.1, 2.2.2.2, and 9.9.9.9) are on the same ethernet segment so they need to elect a DR. 9.9.9.9 is a switch and Im using a SVI for the OSPF interface. Van't get the darn thing to show up in the post but here is the topology.URl After OSPF came up, I noticed that router2 was selected as the DR and that switch1 was selected as the BDR. I thought initially that it was a matter of timing and that perhaps router2 just came up first and the slower SVI interface came up second. Shutdown the interfaces, cleared the OSPF process, and set the OSPF router priority on the VLAN interface to 10.
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Oct 16, 2012
Cisco device is neighbored up with a Brocade device via OSPF, and the desired routes are present.This Brocade device is neighbored up with another Brocade device via OSPF over a GRE tunnel. I am not seeing the desired routes present.What kinds of things can I look at to determine the issue? I think I've viewed the OSPF topology database (I'm not that familiar with Brocade) with the show ip ospf routes command and I'm not seeing the desired routes there either.There is no form of route filtering in place. I'll double check, but I do not believe there is any stub routing going on either.
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Jan 18, 2012
I have a scenario with a Cisco 6506 and a 7206. The 6506 is running BGP and peers with our data center router. The 7206 is a stub router off the 6506 and is used as an edge router for customer T1 circuits. I want to use OSPF between the routers to exchange connected and static routes. The problem I have is that static BGP null routes on the 6506 are overriding the OSPF routes being received from the 7206. Example: The 6506 is advertising a class C network 192.168.1.0/24 to our data center. The 6506 does not utilize the 192.168.1.0/24 network. It is only used on the 7206 for customer T1 circuits and is carved up into /29 subnets. So the 6506 has a static route: ip route 192.168.1.0 255.255.255.0 null 0. Today the routing is accomplished with static routes on the 6506 for the 192.168.1.0 networks on the 7206. Using OSPF the 7206 advertises /29 links back to the 6506, but when I withdraw one of the /29 static routes from the 6506, the /24 null route takes precedence over the more specific /29 routes and the traffic is black-holed on the 6506. how can I get the OSPF routes to look preferable to the /24 null route on the 6506?
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