Cisco WAN :: 2851 / DMVPN As Backup For MPLS Circuit
Jan 10, 2011
Imagine you have 5 sites, one router each site (2851 as CE) connected to MPLS network. All sites have max 3xT1.Requirement:In case CE router or circuit to MPLS fails in any of those sites, I need to provide backup circuit to reach MPLS network.
Proposal:Bring one Internet circuit to each of those sites and create DMVPN to every site.
Question:Let's say Site1-MPLS circuit goes donwn.
Then all traffic from Site1-MPLS should flow thru the IPSec tunnel to all other MPLS sites. Am I right that the traffic coming from Site1-MPLS will ingress via the 2851 CE routers, correct? Is this the typical design? How to accomplish this, I'd like to setup a lab to simulate it.
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Apr 16, 2013
I thought I saw a post/question in regards to "how to" configure a Broadband backup for a MPLS circuit.. What I am trying to do is use a cable/dsl/ broadband (secondary) connection as a backup to a MPLS circuit (primary). I have EIGRP and BGP configured on both the branch endpoint and the tunnel headend. The tunnel is used by the interface that connects to the secondary circuit. The branch location router is a 1841 and the "headend" tunnel router is a 3825. I am wondering about the configuration/syntax of a "weight" or static route that can be used to have data flow over the tunnel when the MPLS circuit goes down - and then switch back to the MPLS circuit when it comes back on line.
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Sep 4, 2011
I need a configuration example of MPLS with VPN as a backup Router cisco 2851
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Apr 17, 2012
how to configure the 2nd WAN port to support 4G/LTE connectivity that will serve as the backup circuit to the primary MPLS circuit?
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Nov 6, 2012
I am setting up a lab network to emulate our production network and am using a single 2851 to emulate both my MPLS provider (only running BGP, not actually running MPLS) and our ISP that we use for our DMVPN secondary network.
Because I am using one router to function as both service providers I am running VRF's to keep the routing tables separated. So far basic connectivity works fine, I can ping from the PE 'MPLS' VRF to the data center CE interface and the ISP side is working as well.
Pinging across the ISP VRF
lab-isp#ping vrf TW 66.193.134.46Type escape sequence to abort.Sending 5, 100-byte ICMP [code]...
BGP is up from both the data center MPLS CE and the data center internet router. BGP on the data center internet router:
lab-dc1-inet#sh ip bgp summ
BGP router identifier 66.193.134.46, local AS number 33415
BGP table version is 4, main routing table version 4
[code]...
BGP on the data center MPLS CE
lab-dc1-1#sh ip bgp summ
BGP router identifier 10.152.1.250, local AS number 65000
BGP table version is 2, main routing table version 2
[code]....
This is my first attempt at using VRF's in this fashion and could have easily missed something or used a config that is not necessary.
Here is the configuration on the MPLS PE/Internet router.
ip vrf CL
rd 1:1
route-target export 1:1
route-target import 1:1
[code]....
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Mar 21, 2013
We currently have 3* offices located in London, Reading and Oxford which have a (ISP) VPLS service to interconnect all sites.I am using RIPv2 for intersite routing between all offices. We plan on implementing a backup circuit at the Oxford office for resiliency.There are 2* Core 4500 Switches, Core 1 is uplinked to the Primary circuit and Core 2 will be uplinked to the Backup circuit.At the moment Core 2 learns all of its routes from Core 1.My question is, if the Primary circuit goes down, how do we get the Routing on the Core Switches to than point out of the backup circuit?
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Feb 8, 2011
We have about 200 spokes (2811 routers), each one connected to two hubs(7206VXR with NPE-G2) via a separate DMVPN. DMVPN is over MPLS cloud provided by the local operator. On the hubs we get very frequently these type of messages
.Feb 9 16:00:10.402: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 200: Neighbor 10.X.X.X (Tunnel3) is down: Interface Goodbye received.Feb 9 16:00:11.658: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 200: Neighbor 10.X.X.X (Tunnel3) is up: new adjacency
On the spoke
Feb 9 13:36:48: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 200: Neighbor 10.X.X.X (Tunnel0) is down: holding time expiredFeb 9 13:36:51: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 200: Neighbor 10.X.X.X (Tunnel0) is up: new adjacency
I think the default eigrp hello and holding timers (5,15) are not suitable since these are wan links.
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May 3, 2013
One of the customers has deployed Cisco 7609S in their infrastructure for Branch/RO connectivity. When we tried to configure per-tunnel QoS with DMVPN for MPLS connected sites, we came to know that Cat 6500 and Cisco 7600 series routers don't support this feature.
Now, we are looking for suitable replacement of Cisco 7609S. I found a document for configuring above feature on Cisco ASR 1000 series routers, but it has many restrictions always.
We are now looking for
(a) suitable platform in the league of Cisco 7609S which support above feature.
(b) suitable technology replacement of DMVPN with minimum restrictions.
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Feb 18, 2013
Installation of 2 x 4 Mbps MPLS circuit on primary router (CISCO 2951) and 1 x 8 Mbps Ethernet link on secondary router (Cisco 2951). We have successfully implement the primary router with 2 x 4 Mbps MPLS circuit. Site is having two computer room CR1 and CR2 and distance between both room is 200mts. CR1 is having primary core router and primary core switch where the service provider terminated the new MPLS circuit and we have done the successful implementation. CR2 is having Secondary core router and secondary core switch where we needs to have the termination of Ethernet link but service provider has delivered the Ethernet link on the CR1 which is incorrect DMARC Location.
Both the computer rooms are connected via optical copper can we use that copper to connect the circuit on CR2, as per my understanding we can use the optical fiber to connect the wind circuit on secondary router on CR2 by using the media connector.
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Jul 10, 2012
I have a question regarding Circuit-speed WAN performance. I purchased a 1Gbps Internet Link and want to know what my max through put would be on that router.
The Data Sheet states 35Mbps, why buy this router if I can not utilize this 1gig circuit.
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May 14, 2013
I am designing a remote site that will have MPLS as primary and a site2site as backup, both connections on the same 2921 router. My problem is monitoring the connection status of the connections? Testing reachability to the MPLS router at the data center would allow bringing up the VPN, but once the VPN is up the data center router is reachable again. Is there a way to track reach ability through a specific interface?
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Jul 11, 2012
I have P router (7206VXR) and I need to export netflow from its MPLS interfaces to the netflow software.
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Jun 4, 2012
We recently purchased a Cisco 2921 router to be our edge device for a small satellite office (24 users). In addition, to the router we purchased a vwic3-2mft-t1/e1 module. Now the surprise, we ordered a bonded T1, I thought we were getting frame-relay circuits from Verizon, but someone ordered a 3M IMA circuit. I am new to configuring serial connections, and had planned out a frame-relay configuration. With that said, I have the following questions:
1. Can I setup a working serial connection to Verizon using the installed ATM circuit and the 2921 and vwic3-2mft-t1/e1 card I have? If not, what do I need in conjunction with the 2921?
2. With the frame-relay configuration, I enable controllers, configured the MFR interface and sub-interface, and serials. How much different is setting up serial ATM connections?
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Dec 3, 2011
I found that ADSL is packet switching type of communictaion. Definition for circuit switching is "A type of communications in which a dedicated channel (or circuit) is established for the duration of a transmission."In practical, telco line connects to the ADSL modem/router through which we are communicating to internet.In this context I have some doubt.The telco line which is connected to our ADSL modem is not shared with any other device ,connects only to the CO of the telco where we get the internet connection.That means the line which connects to the modem is dedicated upto CO.then it becomes circuit switching or not upto the CO.
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Sep 30, 2011
if i plug a cisco 880 router in to a 100MB WAN Ethernet circuit what throughput will i get? on cisco site it says 25mb/sec but if it is Ethernet shouldn't it be done in hardware and get the full 100mb/sec?
I know that a 1841 plugged in to a 40MB WAN circuit can match that speed but Cisco site say it only can do E1 speed.
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Apr 22, 2012
The only option that I have under the IOS that's installed on a 2900 series router is track. I don't have a version that supports SLA. The interface is connected to a switch that the ISP gave, and all of the tests that I've done refuse to make the circuit go down. If I were to lose the circuit, the interface won't show to be down unless the switch were to go down.
Is there any way with track to see that the provider's circuit went down on a switch? I was going to set up sla to ping the ISP's address, but I can't do that unless I upgrade the OS. These are a pair of routers running hsrp at a remote datacenter. Is sla the only way that I'm going to be able to accomplish this? I have tried track with different options in gns and all of them keep the CE's interface up and doesn't show it down. Watching a route in the table isn't feasible because I wouldn't want it to fail over because another site is having problems. Tracking the route doesn't work for connected routes either because the route itself doesn't leave the table as long as the interface is up.
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Jun 12, 2002
I am setting up a T-1 circuit and the instructions for the WIC on the router request that I use a RJ48C cable. I do not have one. Can I get away using a normal RJ45 Cat5e cable?
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Aug 31, 2012
I have been assigned the task of configuring a 3945 router for sip circuit. [code] Where am I supposed to put this config? On the bonded serial link?
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Jun 6, 2011
I need to make sure I have a router available to work with DS3 circuit on remote site. A remote field technician tells me there is a 3745 router with "HSSI" and external Adtran CSU/DSU available. Is that an indication this can work with DS-3 circuit?Which specific Adtran CSU/DSU do I need in order to make it work with DS3?
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Aug 13, 2012
We have 4 switches C3560 running EIGRP. We have PBR in one of them in this way: [code]We have conneceted a dedicated circuit in FastEthernet0/23.
The question is: ¿what would happen if circuit fails but FastEthernet0/23 remains in connected state? 192.168.1.6 will be unavailable.PBR will maintain forwarding traffic to IP 192.168.1.6? This involve that this traffic will fail.
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Apr 17, 2012
Last evening when I turned on lights a circuit breaker was triggered. I turned it back on and it didn't trigger again. I went to sleep but when I woke up this morning and turned on my pc I noticed that I couldn't get online. I checked my router and it was dead - no lights at all. I've tried unplugging it, letting it stay unplugged, hitting reset etc... but to no avail.Lighting and the electric outlets are behind separate circuit breakers, but the only explanation I can think of is that the triggering of the cb and my 825 dying are linked. Am l looking at a dead router or is it more likely that the power adapter got fried? I don't have a fluke at my place right now due to early packing in preparation to moving away in a couple of months time so I cannot test the output voltage of the adapter right now. . Where can I get a replacement power adapter if that happens to be the culprit?
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Nov 24, 2011
There use to be Cisco 851 routers, but lately these routers are replaced with Cisco 861-K9 routers, and these 861 routers doesn't support DMVPN, instead 851 use to be.
Is there any license file we can upload in 861 router for DMVPN capability, if yes may i know the SKU # for that. We have some customers having 6-7 locations and they are planning to have 2 more locations, we implement already DMVPN in there network, if we go with the 87X or 88X router there price is almost double the price of 861.
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Sep 5, 2012
I have a problem with my routers (cisco 1941)I'm running a DMVPN network (Hub and spoke)All the hubs are connected to the 2 hubs. With 4 tunnels. (each hub has 2 interfaces to the spokes. the spokes only have one interface to the hubs, so I splitted them and so I now have 4 dmvpn tunnels). one of the interfaces on a hub malfuntioned and because of that the customers had problems with logging in and sending packets. I made this kind of structure because of when one of the tunnels failed the spoke could use the 3 others... BUT, what happened here was that the spoke still tried to use all 4 of the tunnels and because of that I had 25% package loss!So this didn't work. Now I read about IP SLA, but I was wondering of this could work? (I cannot test it on spare routers, and I don't want to implement it and risking a total network failure...) and how to configure it. Should I make 4 different sla processes which I should all 4 track? And when I make the ip routes, how should I make or configure it so that 1 of the tunnels/interfaces fails that the spoke would addapt the routes?
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Sep 11, 2012
I have a setup with two Cisco 877's – 1 for the hub and 1 for the spoke. The hub has a static WAN IP and the spoke has a dynamic WAN IP. The two sites are tunneled with DMVPN and cert auth for connections via Cisco VPN Client (terminating on hub router). All routes between the two sites work fine – I can see through both ends via LAN IPs and tunnel IPs. I can connect externally through Cisco VPN Client and RDP into PC's on the spoke end via local IPs.
My issue is: I want a port forward on the hub router, pointing to the IP (172.16.1.X) of a device on the spoke end. So using the WAN IP of the hub router, I can reach a host on the spoke side. At this point I cannot get this to work and feel it's related to a NATing issue. Here is my current config for both sites:
HUB Router:
!crypto pki server vpn-ca database level names issuer-name CN=*** CA,OU=*** Services,O=*** lifetime crl 336 lifetime certificate 7305 lifetime ca-certificate 7305 lifetime enrollment-request 1000 database url nvram!
crypto pki trustpoint vpn-server enrollment url http://172.16.0.1:80 usage ike serial-number none fqdn none ip-address ***WAN IP*** revocation-check crl rsakeypair vpn-server 2048 auto-enroll 70 regenerate!
crypto pki trustpoint vpn-ca revocation-check crl rsakeypair vpn-ca!
[code]....
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Nov 25, 2012
I have a DMVPN network with 2 hubs (2821's). This setup is used for VoIP applications over the Internet for teleworkers. At the main hub site I used to have only 1 Internet feed which was DSL with a static IP. Now I have 2 WAN feeds for this site - 1 FTTB w/ PPPoE & the DSL with static IP. Since this site also hosts a PRI, I want all voice communications to go through the FTTB link instead of the DSL for obvious reasons, but keep the DSL as DMVPN Hub for all NHRP lookups as this link has a static IP address & is very stable. We originally put the PRI router as a DMVPN spoke which connected through the FTTB link, with another router acting as the DMVPN hub on the DSL link. This was obviously a waste of machinery. I want to combine both routers into one. So I tried something like this (don't laugh):
Gi0/0 to FTTB (Dialer1 connects to Internet)
Gi0/1 to DSL (Public IP towards 877 demarc)
Tun0 attaches to Dialer1 public IP and connects to other spokes, no VRF
Tun1 attaches to Gi0/1 public IP and acts as DMVPN hub (ip nhrp map multicast dynamic) under VRF "Hub"
EIGRP AS 1 is set up twice, once under router eigrp 1, and the other using router eigrp 2 using an address-family under the Hub VRF.This kinda works but obviously Tun0 & Tun1 do not speak to each other. I also had to remove the ip nhrp map instruction that pointed to Hub1 on Tun0, as this was causing a weird condition in the router where it was repeatedly trying to connect a tunnel to itself, and crash the router because the NHRP process would go haywire. So my users must rely on the Hub2 to get a NHRP lookup for the PRI site. If Hub2 goes down, everything works in the network except for tunnel connections to the FTTB link. I'd rather not have to configure 2 tunnels on each spoke router unless I really have to.
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Feb 15, 2012
We have a Cisco 2851 router that crashes every night. Below is the 'show log' output. The provider is telling us that it is our equipment. We have replaced the router and still have the same problem. Is it our equipment or the provider?
Feb 15 19:29:43: %BGP-5-ADJCHANGE: neighbor x.x.x.x Down Interface flap
Feb 15 19:29:43: %BGP_SESSION-5-ADJCHANGE: neighbor x.x.x.x IPv4 Unicast topology base removed from session Interface flap
Feb 15 19:29:44: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0:0, changed state to down
Feb 15 22:34:13: %CONTROLLER-5-UPDOWN: Controller T1 0/0/0, changed state to down (LOS detected)
Feb 15 22:34:15: %LINK-3-UPDOWN: Interface Serial0/0/0:0, changed state to down
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Dec 20, 2011
We want to get MIB files for snmp v2 from Cisco 2851 Router running with IOS below,
c2800nm-advsecurityk9-mz.124-15.T7.bin
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Jan 31, 2012
We have Cisco router 2851 and asa firewall. We configured on he router for IP phones and ISP connected. The ISP directly connected on the router and asa firewall connected to the router. We have plan to configure VPN on the router. We have available public ip address. if i configure the VPN on the firewall we need to configure firewall local ip address to public ip address. SO how to configure firewall local ip to public ip ? Where we can configure , mean on the router or firewall. Firewall and router configuration.
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Aug 29, 2010
I have a Cisco 2851 (c2800nm-advipservicesk9-mz.124-25d.bin) Router configured with one site-to-site vpn. Is it possible to configure a failover vpn tunnel on this router?
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Oct 14, 2012
I have an office with 50 users. I have both a 2851 and a 2921 available. Which one would be a better fit?
Comparativley, which is the more powerful unit?
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Feb 16, 2012
Do I need to obtain license keys/files when upgrading a 2851 to IOS 15.x? I'm getting a bit confused seeing the documentation that says 1) IOS has gone to a universal image and 2) that feature sets are unlocked based on the installed license.
I was able to download a feature specific IOS image for the 2851 and it did not bother me about licensing upon boot up.
I read one post on here that stated 2800/3800 series (G1) do not have to worry about the licensing piece and that it's just 2900/3900 series (G2) hardware that require it.
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Jan 23, 2013
Is the 2851 router meet these requirements ? if no. What is the must specific series of the routers suitable for this requirement:
1. Comprehensive interface range supporting T1/E1, NxT1/E1, FE, and High-Speed WAN .
2. Wide array of Layer 2 access protocols including Frame Relay, Ethernet, and PPP/HDLC .
3. Rich and granular QOS and instrumentation for prioritizing mission-critical traffic such as voice .
4. A modular platform with a broad range of interface options.
5. Network Address Translation (NAT), and IP Sec .
6. Four (4) auto sensing LAN Ports (10/100/1000) Mbps built-in routed ports.
7. WAN Interface Slots (4-6 option Slots) .
8. WAN Interface Modules (2xT1/2xE1/2xSerial/2xFE/DS3).
9. Memory (512/1024 MB DRAM) .
10. Built in redundancy (Power Supply) .
11. Two (2) Integrated GE ports with copper and fiber support .
12. Support for a Small form-Factor Plugged ( SFP) port for GE.
13. Support Network Timing Protocol (NTP).
14. Security: On-board encryption Support of up to 2500 VPN tunnels with the AIM-HPII-PLUS Module Antivirus defense support through Network Admission Control (NAC) many more essential security features .
15. Voice : Optional support for Survivable Remote Site Telephony support for local call processing in small enterprise branch offices for up to 240 IP phones.
16. Performance : Up to 1GB DRAM Up to 1GB Flash The maximum transmission unit (MTU) Up to 9576 bytes Throughput up to 1.2 Gbit/s .
17. 110/220 volts.
18. Warranty certified by Sis 98 or by OEM (original equipment manufacturer) .
19. Up to 115.2 Kbps for Console/Aux port with DDR capability.
20. Supports IPv6
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Oct 31, 2012
I seem to be having an issue getting a 3xT1 bonded solution to work. I can get 2 out of the 3 T1s to come up and pass traffic, but I can not get the third one to be added to the solution.
Hardware: 2851
IOS: c2800nm-advipservicesk9-mz.124-15.T8.bin
Modules:
NAME: "VWIC2-2MFT-T1/E1 - 2-Port RJ-48 Multiflex Trunk - T1/E1 on Slot 0 SubSlot 0", DESCR: "VWIC2-2MFT-T1/E1 - 2-Port RJ-48 Multiflex Trunk - T1/E1"
PID: VWIC2-2MFT-T1/E1 , VID: V01 ,
[Code]....
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