Cisco WAN :: 3750 - ISIS OSPF Redistribution
Mar 27, 2013
We are currently running ISIS and recently we have purchased 2 WS-C3750X-24. Unfortunately 3750 do not support ISIS and we have decide to use redistribution between ISIS and OSPF. We are using Stack feature so consider 3750 as one chassis.
Router A and Router B are ISIS neighbors. As first step we have setup redistribution between Router A and Switch 3750
Router A Configuration router isis
net 49.0000.0000.0000.0001.00
metric-style wide
[ code]...
Switch 3750 Configuration
router ospf 1
router-id 192.168.2.1
passive-interface Vlan3
[ code]...
From Router's A routing table we see the ospf routes life is good Switch routing table has E2 - OSPF external type 2 routes and is reachable from the rest of the network.
Router A #show ip route ospf 1 Gateway of last resort is not set O192.168.10.64/27 [110/2] via 172.17.1.3, 2d01h, GigabitEthernet1/20 [110/2] via 172.17.1.1, 2d00h, GigabitEthernet1/19
When we bring up the ospf adjacency with Router B the whole ISIS routes are replaced with E2 - OSPF external type 2 which is not desirable.
Router B Configuration
router isis
net 49.0000.0000.0002.00
[ code]...
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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 9, 2012
I am facing two issues in BGP both the topology and Config files.Because the link between Vail and Telluride runs iBGP, both routers will learn about the networks in AS 300 and AS 400 through native BGP only and both AS's do reach each other. Both routers are also running OSPF with Aspen and BGP routes are redistributed into OSPF domain. Now, Aspen knows about the networks in AS 300 and AS 400. Now suppose the link between Vail and Telluride fails, both AS 300 and AS 400 can't reach each other anymore. The only solution to this is to redistribute OSPF routes to BGP on Vail and Telluride. But when i did this, only routes with "O" learned by Tahoe and Alta. In other words, Tahoe sees only 192.168.1.220, 192.168.1.196 and Alta sees only the same routes. Why the redistribution from OSPF to BGP didn't advertise the O E2 routes?
This actually was discussed before but i still can't get it. It is not an actual issue.It is about "Syncronization". I know that we've said many times to turn on Sync. when we do redistribution from BGP to an IGP to make sure that the routes are installed correctly in the IGP routing table. However, as you notice in the configuration, i didn't enable Sync. on Vail and Telluride for a long time and redistribution still works fine.
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Jul 27, 2012
I am having a problem reaching a soho linksys e1000 router through a second hop cisco 2900 router.Here is a brief topology of the network: I am using OSPF area 100 for all networks except for
192.168.2.0 on R1 to E1000 which is RIPv2
R1 directly connects to R2 with a point-to-point serial on network 192.168.12.0 /30 with ip 192.168.1.13
R1 directly connects to a a switchport using network 192.168.2.0 /24 with ip 192.168.1.75
R3 directly connects to a switchport using network 192.168.1.128.0 /25 with ip 192.168.1.129
R3 directly connects to a different cisco router using ethernet on network 192.168.1.0 with ip 192.168.1.1
E1000 directly connects to a switchport using network 192.168.2.0 /24 with ip 192.168.2.1
The switch has a vlan ip on 192.168.1.128 /25?I can ping from R1 to E1000?I can ping from R3 to R1 192.168.2.75? I can't ping from R3 to E1000 192.168.2.1?show ip route on R2 indicates that network 192.168.2.0 is reachable via the serial connection on 192.168.1.12?I have redistributed rip to ospf area 100 and OSPF to RIP on R1?I am wondering why R1 can reach E1000 on network 192.168.2.0, and why R3 can reach R1s 192.168.2.0 newtork, but R3 can't reach the E1000.There is an R2 router than can reach R1 and also cannot reach E1000, but I assume it's for the same reasons R3 can't, so I've omitted the remainder of that topology for this question.
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Feb 15, 2012
I'm looking to redistribute static routes in to OSPF on a Nexus 7k. To do this I'll be using a route-map with a match statement. My question is can you match routes using an ACL, a prefic-list or both. The reason that I ask is that in some docs I've read it states the following:
IP access lists—(For policy-based routing only). Match based on source or destination IP address, protocol, or QoS parameters. This tends to indicate that you can't use IP access lists for the match criteria for redistribution.
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Feb 7, 2013
I have two ospf processes running on a single 3570 edge router that has a dedicated transport circuit back to our network core. We are adding an additional "transport" only circuit into a new location that is also apart of the second ospf process backbone which will connect back to our core. There will also be a 3750 for this new circuit termination. Currently we are only redistributing ospf process 2 into ospf process 1 (1 = core backbone).
#router ospf 1
#redistribute ospf 2 subnet
We have no need to have ospf process 1 redistributed into the process 2 tables. That being said, when we add an additional transport ciruit, or path back to our core backbone, will this configuration present any issues with the redistribution process and failover.
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Sep 24, 2012
Ok I didn't setup my OSPF on my 7010. Today I found out that any static route I put into my 7010 gets sent into to my MPLS network. My 6509's you have to "Tag" the static rout for this to happen. Was under the impression the same was necessary for the 7010 or at least it had to "match" an access list. How can I fix the below so that by default all static routes are not resdistributed into OSPF?
[CODE]...
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May 5, 2012
We have an existing network with OSPF configured between 3750's (DR and BDR) this is working fine.But the Nexus 7k which has been configured to run OSPF, won't established the adj. It is in the same network/subnet.The MTU is 1500.
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Aug 16, 2012
I just want to know how many ospf routes a catalyst 3740 support ?The cisco doc or datasheets doesn't answer this clearly. Because there is only a statement "unicast routes"!? Does this means all unicast routes (eigrp, ospf....static)If so, there is a statement for about 10k routes ?
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Mar 26, 2013
We have a 14 offfice MPLS network. All offices have Cisco 3750s running OSPF which replicate route tables via our providers BGP peers. I am introducing a new network in our SF office which is not directly connected so in SF we have a static route "ip route 172.16.20.0 255.255.255.0 192.168.100.1. I want our other offices to learn this route route via OSPF so that they know how to get to the new network. My problem is that of course remote sites do not see our static routes and i have tried to add this via ospf but the switch will not propagate this route because it is not directly connected to the switch in SF.
router ospf 1
log-adjacency-changes
network 10.2.0.0 0.0.0.255 area 2.2.2.2
[Code]......
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Feb 28, 2012
I have an Metro network running ISIS to different locations. There are severals vrf's on different VLAN's with separate ISIS routing processes. ISIS is running in L2-Only There are two redundant hub routers (ME3600X) that are placed centrally.Connected to each of the ME3600X is an ISR2951 that connects to the internet and handling backup connections over DMVPN. Over those DMVPN tunnels I run MPLS over GRE and routing with BGP. The leaves are IBGP neighbours, and the central ISRs are route-reflectors. In those routers I redistribute from BGP to ISIS and vice versa. The IBGP has an admin distance of 200 and the ISIS route has 115, so in normal operations the ISIS route is installed in the FIB.
My problem is that when an primary connection goes down, I want the backup route via the DMVPN to be redistributed from BGP in to ISIS, and the traffic to go over the DMVPN instead. But what will happen is that when the ISIS route over the primary connection disapear both my ISR's will compete in advertising the route, and as one of the ISR's is advertising it the other one recives it and since ISIS distance are better it will prefer that one, and the other way around. So my routes are coming and going, and everything is unstable. With just one ISR, it works as it should.I tag the route redistributed in to ISIS, but there is no way to add a incoming distribute list to the interface of the ISR in ISIS, otherwise I might have stopped the route in to the ISR if it was advertised by the other ISR.
Also tried to put the ISR's in different L1 areas in ISIS and redistributed L2 to L1 in the ME3600X with an route-map filtering the routes learned from BGP from the ISR's. That works for failing over, but then I'm stuck on the DMVPN bacause when the primary way comes back again, the L1 learned from the ISR is prefered before the L2 learned from the neighbor over the Metro network.
I was thinking of extending the BGP in to the ME3600X, I could of course use EIGRP with distribute-list's between the ME end the ISR. [code]
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Feb 17, 2013
I believe the answer is yes, but incorperating more layer 3 features of our 3750's, I want to know if they fully support EIGRP or OSPF?
Also for a small business of 4 locations, each with a 10mbps fiber and a 1.5mbps mpls... wouldn't you say EIGRP would be easier? Want to look at making the failover automatic if the 10mbps fiber goes down between a site, then the network fails over to 1.5mbps mpls. When the fiber returns in service then the network automatically preferr the fiber again.
Currently we use static routes and if there is a provider outage we have to manually edit the config to flip flop the routes.
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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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May 1, 2012
Is it deemed bad practice to redistribute BGP into an IGP such as OSPF or EIGRP? BGP will only be private routes and not an internet routing table. The reason I have for wanting to redist. into an IGP is so a L3 switch (the default gateway for hosts) can route to different upstream routers (where the redistribution would happen). I do not wish traffic to hit one router (via a default route to HSRP or similar) to then be routed across to the other router via an iBGP, for example-I feel I would like traffic to be predictable. Secondly, I'm quite sure that the first router would have difficulty routing internally via the same AS number as BGP prefers external AS's.
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May 7, 2012
With the network command you can inject routes from the routing table into the BGP process.Why the need to redistribute routes from another routing protocol into BGP using redistribution if you can do the job with the network command?
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Dec 20, 2010
I redistribute our MPLS eBGP routes into our internal EIGRP process at each site. This action undesirably redistributes locally generated BGP networks (via network command) that are meant from the MPLS cloud into our internal routing process.I currently have a route-map on my 'redistribute bgp' command that filters each network manually with an ACL. This works but adds obvious administrative overhead; each WAN router advertises different networks, and the ACL must be updated for each new network.Would it make more sense to simply deny routes from BGP to EIGRP with a metric of 32768? Something like this,route-map deny-local-bgp deny 10 match metric 3276 router -map deny-local-bgp permit 20,router eigrp 100 redistribute bgp 65104 route-map deny-local-bgp.
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Sep 20, 2011
I have two 7604 routers running IOS 12.2(33)SRB5a as ASBRs in my network. They both connect to a common AS via DS3 lines.FR01 is considered my main circuit, FR02 is the backup. But I have some heavy disk sync traffic I want to route via the backup unless that circuit is down.How could a static redistribution possibly influence all my routes ?
Here is the remote AS config on both routers. We summarize the routes and only change the redistribute metric to distinguish main from backup circuit :
[code]...
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Sep 6, 2012
Is there a known bug for Nexus 7K version 6.0(4) related to route redistribution?I have few vlan interfaces and being redistributed to the BGP.vlan interfaces are all up ang pingable.After configuring redistribution, vlan route is not in the bgp table.sho ip bgp is saying "path invalid"
BGP routing table entry for 10.165.101.192/28, version 26302
Paths: (3 available, best #3)
Flags: (0x180c0021) on new-list, is not in urib, need resync with RIB, exported, has label
vpn: version 47719, (0x100002) on xmit-list
local label: 492294
[code]....
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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 18, 2011
we are looking at adding our ASA's to our EIGRP autonomus system. .is it possible to redistribute "routes" which are accessible only from a site to site VPN? I put "routes" in quote marks because the remote networks do not appear in the routing table.BTW the firewalls are running ASA 8.4(2)
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Jun 30, 2012
Do I need the Universal image to perform stftp on a 3750 or 3750-X?
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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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