Cisco :: OSPF Multi Access Network
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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Jan 15, 2011
I want to configure multilink between two Cisco 7206 routers POS interfacesafter configuring both sides.Router 1interface Multilink5 ip address. [code]. I can see both sides through show cdp, also ospf process goes to FULL stateBut traffic is not flow between interfaces, and i can not even ping router's own ip address.When i delete network statement from ospf process, i can ping router's own interface and both routers can ping each other.
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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 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)
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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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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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Jul 8, 2012
Why is there no DR/BDR concept in EIGRP multiaccess networks? If the purpose of a DR/BDR is to limit excess traffic when there is a change in the topology, why isn't there one in EIGRP? I understand that DR/BDR share LSAs and not routes but the concept is still the same: there is a change in the topology and the change gets flooded to all neighbors, those neighbors in turn flood it to their neighbors on the multiaccess network thus causing excess traffic.
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Apr 4, 2011
I have a situation here where the company is rapidly expanding through acquisition. They are essentially a holding company and own several smaller entities. However most IT is consolidated as new entities are brought in and run out of Headquarters because the Board of Directors/Executive Mgt do not see IT as important and so the budget is extremely limited.
They have approximately 200 remote users at any given time, but they all work for these smaller entities. Currently each location has its own Dedicated Internet Access and VPN appliance (Netgear ProSafe, Cisco ASA 5510, I know of one entity that is just port forwarding to each workstation for RDP ).
They would like to route all traffic back through Corporate so they can consolidate this VPN mess and quit paying for all different kinds of licensing, and also stop paying for dedicated internet access for each location and just use the MPLS and have all traffic inbound/outbound run out of the corporate office.
The only issue is they dont want users to be able to access network resources at other organizations.
Like I said earlier the Board of Directors/Executive Mgt do not see IT as important and so the budget is extremely limited; so if there is an OpenSource option available that would be best. Also the IT dept there is 3 people (IT Manager (IBM AS400 guy), two Helpdesk guys (no certs, HS GED)) So the knowledge resources are limited as well.
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Jan 18, 2013
I wish to build a test rig in my office that will act as 2 separate geographic locations with a router at each location connecting to a make believe MPLS kind of network. I then wish for these sites to communicate with each other but obviously be on separate IP ranges .I know each site would have a router and I assume that there ideally should be 2 corresponding (provider) routers on the MPLS network. What I do not know is how the the routers at each site should connect physically to its partner router at the MPLS and also how the two MPLS routers would connect together. For example, if I wanted to later scale up to have 4 geographical sites how would the 4 MPLS routers connect together (using a switch?)?
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May 21, 2011
This is my network topology. Sometimes it just suddenly loses conenctivity or traffic for unknown reasons, like the internet hangs for much time or maybe some routers just stop responding, even restarting ! Do you think there should be a Multi-WAN router that could take 4 WAN lines and give one LAN to plug at a switch for a better performance ?I know that my setup is wrong, give me your opinion about it and how to fix it .
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Jan 23, 2013
I have setup a 5515-X in transparent multi-mode and setup 5 security contexts with inside and outside ports, one admin and 4 others. The problem I have run into is setting up a management IP for each context. On one of my other transparent firewalls in production we were able to apply an IP to the security context (not interface) however the new firewall is running the latest software and this same functionality is not available. The only options for IP in context mode is IP AUDIT. So my next plan was to create sub-interfaces of the management interface and assign one to each context however the 5515-x does not allow sub-interfaces on the management interface. How I setup a management IP on each context?
Another interesting thing i read is that the managment IP assigned to a context (if i could figure out how to set it up), has to be in the same subnet as the data interface which if fine but it also says that the management interface should not be connected to the same switch as the data interface because of MAC address table update issues, meaning that i could not use a sub-interface of one of the already configured context ports.
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Jun 21, 2012
is it possible for a client to choose a WAN to use when being routed through a Multi-WAN router? Something that could be configured as default route in linux or default gateway in winxp ?Or is this decision totally up to the router itself ? [code] Could now a client on the subnet 192.168.0.0/24 choose 1.1.1.1 as a default route for example? And if not, could this be possible if the router hat some secondary internal IPs for both WAN interfaces.
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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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Feb 2, 2012
I want to measure the the ospf convergence time on the given network topology (assume 5 nodes - partial mesh topology).I am using quagga software as routing software on linux box. Quagga is runnign fine and network is converged, able to see all the routes.. Quagga software is logging all the osfp information includign packets,state machines,etc.I am going to disconnect a link between node a to node b. and i want to measure the convergence time of the network.What is the network convergence time?My answer is, The time taken to reflect the topology change (link down/up, network condition change) to all the routers on the topology.Some routers(close by routers to the topology change) will get converged fast, and some routers(far away from the topology change) will have the higher convergence time. we have to take the highest convergence time of the router on the topology and we can says thats the ospf network convergence time.
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Jun 23, 2011
I have 30 branch all over the country.There we have Cisco 3825 Series router at HO, and 892/k9m 1841 and 1811 routers in BO.My branches are being connected to HO via dual link which has been linked with two ISPs,both are Layer 2 link provided by the service provider,
-ISP1 subnet: 172.19.0.0/24
-ISP2 subnet: 172.20.0.0/24
usually i have the route pointing to HO ip from each branch routers. [code] Where, there are four branches acting as the gateway for the branch router 172.20.0.13. What cause the problem,and how can I solve this issue permanently?
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Aug 21, 2012
We have an OSPF network with four 6500 Distribution Switches. They are fully meshed and see each other as peers and are sharing routes. Off of one pair (Border) there is a setup of 3750G siwtches that go off to another network and they do not run OSPF. Between the Border Dist and the 3750G Switches we run HSRP. The 3750G side uses HSRP GP 192 and the Dist Side uses HSRP 192.There are static routes on the 3750G pointing to the Dist HSRP address to get back to network.Pings fail from the OSPF side to the HSRP address on the 3750G side.If I do a trace from the OSPF side to the HSRP address it hits one border dist switch then the other and fails.If I have static routes on both border dist switches pointing to the HSRP on the 3750side, do we need to change the metric on one dist so that it is preferred over the other or should the router Id take care of that?
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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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Mar 21, 2012
Multi brands ips in one PC?
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Dec 15, 2010
We have network consisting of approx. 8 7200's running LNS/MPLS/BGP and we provide predominantly private networks to clients(Majority of client networks are a mix of Ethernet tails and DSL).We have received a request from one client to support multicast - Having never implemented multicast, have a few questions:
1. Is is supported/possible to provide multicast within a vrf on 7200's?(From initial investigations, it appears to be)
2. Is it possible to only enable mutilcast in a vrf(i.e. not globally)?
3. Any recommended guides/best pratices?(Googling has revealed nothing really that is similiar to what we want to do)4. What are the potential ramifications?(Resource overhead, Security implications, anything else?)
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Feb 6, 2013
I have configured my two vdsl link with ppp multilink but i am not getting the desired bandwidth. Here is my configuration is this okay or i need something more in the configuration. My router is 2921 what is the maximum WAN throughput of 2921? [code]
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Feb 19, 2012
is there any known issue in configuring multilink ppp using an old WIC-1T and a newer HWIC-1T on the same Cisco 1841 router ?
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Mar 15, 2012
Is it possible to install LMS 4.2 in multiserver mode but with possibility to select installed components/applications? I'm talking about Solaris version. I can't see such an option. It will install all the components on every server which I don't want to. We have LMS 3.2 working in such setup: one server with most major components, other running just DFM and third one with only HUM installed.
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Mar 26, 2013
I'm trying to find out what platforms support Multilink PPP with Link Fragmentation and Interleaving over a single link, when that single link is PPPoE. In searching the documentation, the best information I can find is that it seems to be supported in one direction on the ASR1000 url...Many platforms appear to support PPPoE and also MLPPP w/LFI, but it's not clear that both features are supported on the same link.
The application is a radio that has an Ethernet interface on its terrestrial link, and acts as an Ethernet bridge. Would like to use Multilink PPPoE with LFI in order to provide LFI in order to run VoIP over lower speed links (e.g 256kb). For what it's worth, the radio also supports RFC 5578 PPPoE Extensions for Credit Flow and Link Metrics. It was fairly easy to find what platforms support RFC 5578. But RFC 5578 would be used to support variation in the capacity of the link. If the link speed is fixed, RFC 5578 is not needed. I was trying to find if the set of platforms supported increase if the need for RFC 5578 is taken off the table.
In particular, I'd be interested in the whether the ASR 9000 series supports MLPPP bundles with LFI when the links are PPPoE.
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Nov 4, 2012
I have a question that so far I haven't been able to find a suitable answer for. This is focused from an ISP perspective. So suppose I have the following scenario:
I have a BGP transit area. On each edge of the my network I have a e BGP connection to the same client for redundancy. This client has his own ASN, iBGP and prefixes. I'm receiving the same NLRI from the client through both sides. Let's assume he's advertzing the prefix 10.10.0.0/16 through both ends. I'm receiving it with no problems and I'm passing it along to the next providers with whom I also have multiple ingress and egress points.
Something like this:
PROVIDER A PROVIDER A
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eBGP eBGP
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CLIENT A (ASN65100) --- eBGP --- MYROUTERA(ASN65200) ----- iBGP --- MYROUTERB(ASN65200) --- eBGP --- CLIENT A(ASN65100)
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eBGP eBGP
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PROVIDER B PROVIDER B
Let's say my client pays for a 10Mb. Both links are configured to 10Mb so that each can handle the load in case the other one fails and both are always active. So my question is:
How can I shaped or police the client's traffic across multiple points of entry on different routers so that it won't go beyond the 10Mb. The same scenario applies on how can I limit traffic coming from the providers A, and B destined to the client's prefix: 10.10.0.0/16.
I don't mean using MED, local-pref, weight. Sure I can funnel all the traffic through one single point, but consider that I'm also trying to move away from basic routing and more into PfR, which mean that I have more granular control of the flows. Perhaps there is a PfR service-policy or something that can work.
For this scenario I'm using 7200 as my routers. If there is a solution that assumes any other model don't hesitate to post it. TLDR; How can I police or shape across multi interfaces on different routers?
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Aug 24, 2011
Domain A (Forest 1) <--Two Way Trust--> Domain B (Forest 2)
ACS is joined to domain A.
My question is AD integration (Not LDAP) supported between 2 domains in different forests?
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Jan 18, 2011
enable multicasting over the WAN. I have a 6500 SW connected to router and from router I have 3 MPLS links connected given by different service provider running with EBGP. I have around 30 branches running EBGP with Service Provider, and want to multicast VC to branch location from DC.
How to do that, what are all the things I need to enable in my 6500 Switch as server is connected to this switch.
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Mar 11, 2011
Before I get into asking questions about the routers, firewall, and static IP though I want to knock out the most base problem. I plugged a computer directly into my cable modem, disabled the windows firewall, tried canyouseeme.org, and couldn't connect to any ports anywhere in the spectrum. I would assume that being plugged directly into the modem that all ports should be wide open. The port I was originally trying to open was 8093. I called my cable provider and the tech told me that I'm not allowed to have port forwarding in a range as high as 8093 without a business account. I asked the tech what range I could use and he said he didn't know. I did some searching on the net and found that on a typical home cable connection I'm allowed ports 1 through 1024, so I tried numbers all over that spectrum on canyouseeme.org and got no response from any of them. Again, this was while plugged directly into my cable modem with an ethernet cable and my windows firewall disabled. From what I know this has to be wrong in some way, as to use the internet at all I have to have ports available. The only possibility I can think of is that maybe canyouseeme.org is flawed in some way. So the first in a long series of questions to come is why am I unable to find any open ports while plugged directly into my cable modem with my windows firewall disabled?
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Oct 4, 2011
With the risk of sounding like I'm looking for a "personal shopper", I'm looking for your opinions on a new wireless router for a small business. We already have a WatchGuard firewall. We are just looking to provide visitors and staff wireless access. We want visitors to only be able to access the internet, but we want staff to be able to access the corporate network as if they were plugged in via Ethernet. (RADIUS - AD authentication).
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Nov 14, 2011
I want 2 ask that how can i detect other multi login in facebook! that 1 user is talking with me in multi user!
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Mar 26, 2010
Recently upgraded to 1.33NA. I keep getting this message when changing certain settings (such as enabling a guest zone). It's essentially locking me out of changing the system!As far as I know - the DIR-655 DOESN'T have WDS - this was removed a number of firmware revisions ago. I cannot find a setting for this anywhere. There are a few mentions of this on this forum and the web, but nothing concrete as to why it's happening or a valid solution.[url]...
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Dec 21, 2010
I've just installed two ACS 5.2 appliances and I'm trying to get them to join my domain, I've setup an account that has the relevant permissions (tested the account on a laptop and it can join the machine to the domain).
The ACS keeps coming back with an invalid credentials to join the domain error despite the fact that I know the user in question has the correct permissions.
I have a suspicion that the problem is related to how the ACS handles the Active Directory Domain, we have a large domain that spans several domain controllers. The DNS server uses round robin DNS to serve a different DC's IP each time, however a typical windows laptop is aware of what controllers it's allowed to use whereas the ACS box doesn't appear to be.
The ACS servers are located in a network in the UK that is only allowed to talk to 2/6 DC's and I have no way of controlling what IP appears when the ACS tries to join the domain due to the round robin DNS.
Is there any way to get around this? Or any way to hard code a specific DC for the server to connect to? Even being able to add the DNS manually to a hosts file would work.
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Feb 4, 2012
Recently i have configured ASA5550 with 2 Contexts in Transparent mode. Traffic can pass through a single Firewall context but through both contexts it couldn't.
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May 4, 2012
Scenario: I have a vmserver w four virtual servers all in configured w in different subnets. What's the best way to configure a 3750-x switch to route traffic from the virtual servers to their vlans?
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Sep 25, 2011
my Networks contain three devices (BPX, DVR, PC) need to fixed IP, do you router supports the Cisco SRP547W Static Public ip.
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