Cisco WAN :: 3845 Best Route Between Two Links
Apr 29, 2013
We have a 3845 router at one of our remote sites. We want to connect the router to our central office using the two gigabit ports. One link would be the primary and the other would be the secondary (backup).
The router is running EIGRP and the two ports would have different ip addresses. How can we set up the router to use gi0/0 as the primary port and gi0/1 as the secondary (backup) port? The backup port would only be used if there was congestion on the primary port or if the primary port went down. Is there a way to force the router to make the primary link the best route?
Remote Router Sample Config:!
int gi0/0
desc primary link to Central Office
ip addr 10.0.1.84 255.255.255.0
[code]....
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Mar 20, 2013
I have one Cisco router 3845 and one switch 6509, they have two links connected each other via OSPF, I want to have link 1 as high priority, and link 2 as low priority. When the link 1 is down, it can be kicked in to the link 2. How I can implement this setup.
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Apr 12, 2012
i have two Cisco 3845 routers connected to 3 different ISPs ,
-ISP 1 with link bandwidth of 24 Mbps
-ISP 2 with link bandwidth of 16 Mbps
-ISP 3 with link bandwidth of 8 Mbps
i have a public AS from a ripe along with 2 Class Address (Public independent)
1) what is the best design and configuration to utilize the 3 Links ,outbound and inbound (since we have our public address along with AS) my boss told me,all These 3 links must be active
2)what is the recommended design and configuration for the whole topology , pls share the best gotchas
3)what is the need of iBGP?why we need it when we run bgp?
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Dec 6, 2012
I have a 3845 that will not let me ping to the internet from my PC.On interface g0/0 I have a connection to a internet connection (another router), using DHCP to get it's address (it gives g0/0 IP 192.168.0.3).On interface g0/1, I have a connection to my LAN (I assign the interface IP 10.10.1.1).
I can ping the router. The router can ping the internet, do DNS resolution, etc.I have ensured routing is enabled. The only route I have configured is a default static route: 0.0.0.0 0.0.0.0 192.168.0.1.Oddly, if I choose 0.0.0.0 0.0.0.0 g0/0, I cannot ping sites on the internet from the router.
I tried setting up ip nat inside for my LAN and ip nat outside for the WAN/internet uplink, but this did not work.
This was the issue, I missed finishing the NAT setup.I can make the router ping out all day, and have my PCs ping the router, but getting the connection between the two is not working.
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Feb 6, 2011
I m using ospf between HO and Branches for two links. branch router are 2811 and HO router 3845. when i enable ospf at branch i get all branch route like HO router and a default route. My requirement is each branch get only HO but no other branch. I have no default route.
I attached show ip route status for a branch router.. Why default route comes and why all branch's route come ?
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Dec 10, 2012
Is there any physical or technical diferrences between PWR-3845 AC/2 and PWR-3845 AC? We are trying to order replacement parts and wondering if PWR-3845 AC is for one power supply and AC/2 means you get two with one order?
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Dec 7, 2012
Is there any physical or technical diferrences between PWR-3845 AC/2 and PWR-3845 AC? We are trying to order replacement parts and if PWR-3845 AC is for one power supply and AC/2 means you get two with one order.
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Jun 24, 2011
I've enabled antispoof on all interfaces on asa 5510.If you start a traceroute to a network on the default route, everything works, since replies comes to an interface with route 0.0.0.0/0 defined.If you start a tracer route to a network that is NOT on the default route (let's assume coporate MPLS), you only get response from first carrier router, the other are discarded because of anti spoof violation.
I have ICMP inspection and icmp-error inspection enabled.
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Feb 6, 2013
I have configured four E1 links between two locations on my 3745 using WIC-2T cards. At both ends all the serial links are configured as ip unnunmbered fastethernet 0/0 encapsulation ppp OSPF is enabled without CEF I would like to know how load balancing will occur in this scenario?Will all my links be utilised at the same time? Will multiple links be used only when the need (in terms of bandwidth) arises?
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Jul 13, 2012
I will be configuring all the MEC links on my 6500 VSS chassis tomorrow morning and one thing I am a bit confused about.According to the best practices guide they suggest you configure all etherchannels trunks to be in desirable mode. All the trunks are using LACP active - active right now but that's only to one chassis.Should I change all my MEC etherchannel trunks to desirable mode or just leave them active-active?
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Jan 31, 2013
I have a customer with a unique configuration. They have two point to point connections - one using a laser link between buildings, and a backup fiber connection running ospf. Issue is when the laser link goes down, there is loss/no forwarding during the reconvergence, causing issues with transffering video feeds.
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Dec 20, 2012
I got a Cisco 870 router. running C870-ADVSECURITYK9-M), Version 12.4(15)T7, does this support two link from different ISP.
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Apr 18, 2011
I purchased a Cisco 520 and am trying to set it up on my home network.Its ADSL PPPoA for WAN.I am trying to setup 2 LANS. One General Network,One DMZ for webhosting.Now, since this router has 4 ethernet ports, i assumed i did not need VLANS. Except when i try configure an interface with an IP address i get this error: % IP addresses may not be configured on L2 links.Now. Ive looked around on the internet about this error. And it seems that since these interfaces are not Layer 3 interfaces,they need to be associated with VLANS.This would be OK. Except this requires an IP address on an interface on the router! Back to square one.
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Mar 12, 2012
The regular problem with the LMS topology and WAN Links when you see the branches are disconnected from the HQ BUT in my case the branches are already connected via Layer2 links but unfortunately some intermediate layer2 modem/switch exist in some branches which prevent CDP discovery but you will find both HQ and branch router in the same subnet .
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Nov 3, 2011
I have two Internet links:ISP1: only Site 2 Site VPNsISP2: only HTTP/HTTPS traffic and incoming remote access VPNs With the security plus license I could correctly configure them both as active at the same time on the same ASA device. Also, I've successfully accomplished the following traffic separation:
Site to Site VPNs goes out through ISP1HTTP/HTTPS traffic goes out through ISP2 The customer request is that, when ISP1 fails the S2S traffic is relayed through ISP2 -> This is working fine, I've already tested!But when ISP1's service is restored and that link is working fine, I want that the S2S VPN traffic gets relayed through it again automatically, which didn't happen. My question is: using SLA will the S2S traffic be relayed through ISP1 again automatically when it's services are restored? If not, which technology should I use to accomplish this?
PS: This is all configured on only 1 ASA 5505 whose license was upgraded.
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Aug 16, 2011
a few of my links (all BT ADSL on Cisco IAD887s) suffer from drops in PPP, the physical circuit doesn't drop out, just the PPP and LCP
000489: Aug 12 12:13:22.085: Vi2 PPP: Missed 5 keepalives, taking LCP down
000490: Aug 12 12:13:22.085: Vi2 PPP DISC: Missed too many keepalives
000491: Aug 12 12:13:22.085: Vi2 PPP: Sending Acct Event[Down] id[19]
000492: Aug 12 12:13:22.085: Vi2 IPCP: Event[DOWN] State[Open to Starting]
000493: Aug 12 12:13:22.085: Vi2 IPCP: Event[CLOSE] State[Starting to Initial]
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Oct 12, 2011
We have a site to site VPN from one client location to our production center in offshore. At the client side we have a PIX 515 used for the tunnel. Since the client requires a backup VPN over a different ISP we will have to add the ISP to the same PIX and then create the secondary VPN.
how we can acheive two ISP's on one PIX since only two Ethernet ports are availble.
PIX Details:
Cisco PIX IOS 7.2(2)
PIX-515E, 128 MB RAM
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Sep 26, 2011
i have two links between two sites in my company. The second one is new and uses IPVPN connection. I am searching a way to use both of them. I don' t want to load balance. I want to send some protocols from the first link and some other from the second. ex. rdp from link 2 and everything else from link 1
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Jan 22, 2012
Any good way of depicting serial links in Visio? Manually drawing is pretty clunky and quick searches in google isn't turning up much.
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Jul 18, 2012
can a Cisco 2811 router bundle 2 or 4 ADSL lines ? Reason am asking, we need a device that would be able to bundle 2 or 4 ADSL lines from ISP so that we can you it as backup link in-case the company Internet link does down.
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Mar 25, 2013
I am using Cisco 861 router for simple network access. I have configured the router correctly with support from few folks of this community but now I am facing a different problem. I am able to ping, tracert and nslookup any internet destination. I am also able to brows secure sites like [URL] but normal URLs like [URL] is not working. I have tried to debug IP TCP Packet Port 80 but it is not showing any results.
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Sep 5, 2011
I have two sites with identical asa 5505's and each has the dual wan/ISP links and are set for failover using sla monitor tracking. I would like to create a vpn between these two sites that stays active regardless of which ISP link is online. Do I simply make two crytpo map statements10 and a 20 inside each of the asa's to each of the other ASA's STATIC PUBLIC IP's? [code]
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Oct 17, 2011
I work with the topology view in LMS 4.1. I can see all the links between the differrent switches (N7K, 3750, 3040).I miss only the links between the different N7K's. This links have one special thinks: they are configured as " rate-mode dedicated force" In the N7K cli this interfaces are displayed with the SN too.
sw-bb13# show cdp ne.The links to sw-bb11 and sw-bb21 are not painted in the topoloyview.
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Jun 21, 2012
Using Topology I can show device view from all my managed VTP domains. I don't understand why all links are "not in network"!?
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Apr 21, 2011
We suffer some problems with our remote 2811, that has two WAN links (two different ISP) - we cannot get access to both of WAN at the same time.
At first, the aim was to load balance the traffic between wan links: at first we tried to use OER, but users complained about instable internet connectionthen we tried PBR + NAT Generelly we have just the same scheme as [URL] : dual WAN linksPPTPPPPoE over ADSLequal static routesNAT using route map The problem itself: When both links are up, the 1st WAN is pingable, and the 2nd is notWhen the 1st link goes down the 2nd becomes pingable and accessible and vice versa. When I disabled the CEF, the 1st was still pingable and the 2nd became pingable too, but very unstable
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Oct 16, 2011
I currently admin a WAN link between two international sites. I have a 2800 at each end. The primary connection between the two sites is 20MB Ethernet PIP MPLS BGP circuit. I also have a pair of T1's in a PPP multilink that I switch over to in the event the primary circuit goes down. I currently am doing the switch over manually. It takes me about 15 minutes to complete it, but I know there must be a way to make this an automatic process.
So a couple questions:
1) Is there a way to create an "enhanced multilink" with the 2 T1's and the Ethernet circuit in the same bundle, in effect giving me 23MBps bandwidth while still being able to maintain connectivity if one of the 3 links goes down? This is my preferred solution
and if 1 is not possible then
2) Is there a way to configure the router so if the Ethernet circuit goes down, all traffic will be automatically directed over the T1's, and then come back to the Ethernet when it's back online?
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Oct 25, 2012
I have the following setup, eBGP to the same ISP, iBGP inside the AS between the routers and 6509s
I would like to do the following, lets say I have 1.1.1.0.... 1.1.6.0
These are advertised by my 6509s through BGP. I would like to balance the traffic across both of the links, so inbound/outbound traffic would be
[code]...
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Feb 2, 2012
I have a cisco 2801 router and I want to connect two ADSL links on it and balance the load but not that kind of IOS that team would need
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Dec 19, 2011
I'm workig with a friend on a project. The setup in place is on yacht that has 4 V-Sats and they are wanting to load balance across all four of these links via a Cisco 2911. My recommendation to him was to just create 4 static default routes to each V-SAT's ip address.
Would this accomplish the goal of load balancing? My concern is that would it actually load balance amongst the 4 links or just choose one and then move other to another link once the initial primary went down? Also would enabling CEF be an option if its a feature the 2911 can do? I've attached the visio to give a better idea.
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Jan 26, 2013
cannot access the link to renew my password - links always disabled.Have tried in the browser; does not work.cannot open any links in emails at all.
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Aug 12, 2012
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Nov 24, 2012
I have a links wireless system, I am trying to make this a secure connection. I have gon into the property settings and everytime I try to set the security to wpa2 or even wpa it I lose my internet connectivety. I can't get the security key needed.
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Jan 20, 2011
My router (DIR-655) is all up and working but the only thing thats not working is a link to a picture posted on a web site. If you take the link and paste it in the web browser it displays fine, on a web site that should show the image in a forum, All I get is a white box with a X in it.
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