I have a production L3 3750 stack with 2 WAN connections, which is connected to the companies WAN infrastructure using EIGRP.Recently there have been a number of hello drops from one site, which is causing the EIGRP adjacency to drop and so the whole site goes down from the rest of the WAN. Physical cabling has been replaced towards the ISP router, and the ISP have found no issues on their equipment or circuit.on occassions the utilisation is high on the link, so reasons for the hello packets to be not reach the end point, but other times the links are lowly used.The WAN links are active/standby, so the active is always used, but the EIGRP adjacency is dropped by both links.
I am looking to implement 25 Cisco 3750 switches with IPBASE image at the edge, across many cabinets. I understand I am limited to EIGRP Stub on the 3750 switches (with IPBase) and cannot acheive funding to upgrade to IPServices. Though I am not fully aware on the limitations, in terms of what I am trying to acheive.
Broadly speaking I want to install 2 x 3750 switches at the edge, with point-to-point links to two 6500 core switches (at the data centre) and then have HSRP interfaces on the 3750's, tracking the up links to the core switches. I am presuming this will be the best solution to ensure reliability.My 6500 switches run EIGRP and have many VLANs and other L3 networks advertised, which will need advertising to the 3750 switches. I would be looking to advertise two or three HSRP networks on the 3750 switches, up to the core switches.At the moment, the entire network is Layer 2 (VLANS + STP).
how to configure EIGRP across the 3750 switches and 6500 switches to allow for the 3750's to see the whole network and also advertise back up it's directly connected (HSRP) networks to the core. At the moment, after configuration, none of the switches see each other as EIGRP neighbours but can ping the L3 addresses on each end.
I have 3750 switch and there are couple of vlans.....i dont want to run the instance on all vlans....so i have decided that i will run passive intreface default command....now my lan link is layer three and i want to run eigrp on that so the command shd be as under?
no passive interface default interface gig1/0/10 no passive interface default interface gig1/0/22
(as i have 2 conections) and want to have two neibours.
I'm trying to configure load balancing on a network that is using 4 3750 L3 switches. The network is comprised of two sites with two switches at each site running HSRP and the virtaul IP is the gateway for a server between the two switches. The sites are connected by two independant 200meg ethernet connections (technically they are GigE limited to 200meg) p2p circuits. The switches at site A are connected together via a GigE port and the server I have connects to each switch at its respective site using a GigE port and the same for site B.
The problem I'm running into is that I've noticed that one of the 200meg circuits is always idol unless the primary goes down, so I'd like to be able to load balance the traffic from site A to site B using both p2p circuits. I think the problem that I'm running into has to do with the fact that HSRP is putting one of the links from the server to switch in standby unless the WAN link goes down and therefore traffic is not taking the "longer route" to the 2nd 200meg circuit.The only traffic going across this network is only the two servers sending traffic to one another. how I can get load balancing to work or if it is a possiblity with this network topology?
we are facing issue for unstability of EIGRP neighbor with ISP router.Both router are connected via 3750 switch.There is no misconfiguration or physical media issue.I found the SDM template on the middle switch is desktop default, does this will impact ? [code]
I have a hub and spoke WAN that conisits of one core location with with a 6500 and nine other buildings using 4006 Catalyst that conenct back to the core via dual gig fiber. We are using EIGRP at each location as well as the core. I was tesing something at one of our buildings decided to hang a 3750 off the 4006 and enable the same eigrp process on the 3750 that is enabled on the 4006 and 6500 (EIGRP 1).
1. All the routes that the 6500 knows about are advertised out to each of the nine locations. 2. The 4006's are all advertising thier directly conencted routes to the 6500.
Onto the location I was testing at:
The 4006 where I was testing at has four vlan interfaces enabled and they are in an UP/UP state. The ip routes from the 4006's directly conencted vlan interfaces propogate to the 6500 at our core location and the 6500 sucsefully propgates these learned routes to all the other 4006's.
This past Friday I configured a 3750x with two /22 vlan interfces and one physical gi port with an IP address and also configured on Ethernet port on the 4006 with an IP address in the same network block as the 3750x gi interface (a /30 netowrk block). I saw both interfaces come up and EIGRP sucesfully established a neighbor adjecency between the 3750x and the 4006.
I noticed that the 3750 advertised out all of it's directly conencted routes to the 4006 and the 4006 advertised it's directly conencted routes to the 3750. However, the 4006 did not advertise any of the routes it had learned from the 3750x to the 6500 and nor did the 4006 advertise any of the routes it had learned from the 6500 to the 4006. My suspicion is that the "eigrp stub connected summary" statement is enabled on both the 4006 and 3750 thus prevenintg them form advertising out any routes other than thier directly conencted routes. Can any of you verify that I'm either correct or inccorect about this?
here are the eigrp statemnets from the 6500 and 4006:
We've put in a 3750 at our corp hq (Detroit). We did this to break up the current flat 172.16.0.0 /16 network into separate VLAN's for various purposes. We plan on doing that at another site (Farmington), which will become a DR site. We are running EIGRP throughout the organization over an OPTEMAN netowrk and also sending routes to a managed MPLS network which uses BGP. BGP redistributes into EIGRP and vice versa. I've attached a pdf of the network. The 3750 core at the corp hq is a temp core, hopefully upgrading to Nexus within a year or two. This problem didn't exist until the 3750 was introduced and became the gateway for the site. The OPTEMAN router was the gateway and was on the same VLAN as the MPLS router.
So, in detroit we have an Detroit-MPLS router, Detroit-3750, and Detroit-OPTEMAN. What I'm seeing is that the routers I'm getting from the MPLS router make it to the 3750. The 3750 advertises those routes to the Detroit-OPTEMAN router. However, the OPTEMAN router doesn't advertise these routes any further..
In Farmington, it is currently set up like Detroit used to be set up. There is a flat network and both routers are on the same VLAN, no L3 core switch. Routes come in from the MPLS, get advertised to the Farmington-OPTEMAN router, distributes the routes out to all OPTEMAN connected routers, including Detroit. However, Detroit is not passing that route to the 3750.
When we made the 3750 stack the core, we didn't change anything else, except for some IP changes. Why these routes aren't fully redistributing?
Detroit-3750 Stack WS-C3750G-24TS-S <-Stack master running c3750-ipservicesk9-mz.122-55.SE7.bin WS-C3750X-12S-E <-Running c3750e-universalk9-mz.122-55.SE7 show sdm prefer The current template is "desktop routing" template. [Code]...
I have a 3750 at a branch running EIGRP connected to two routers that both have configured:
access-list 1 deny 0.0.0.0 access-list 1 permit any access-list 2 permit 0.0.0.0 access-list 2 deny any
router eigrp 1distribute-list 1 out FastEthernet0/0distribute-list 2 in FastEthernet0/0
Due to this recently applied config the switch become unreachable from the outside and cannot ping anything. Everything connected to it works fine. I was able to remote into it from a switch behind it and noticed that the 3750 has no default route in the routing table. I do see a default route in the eigrp topology table. How to make the switch learn a default route maintaining the existing configuration on the routers.
I'm attempting to redistribute a static route into EIGRP on a 3750 switch and pass it to an upstream router, sadly however this isn't working, or at least the route isn't being recieved on the upstream router. [code]
I am working at a client site today on a routing issue. I am currently working on an issue where a 3750 switch running EIGRP will not update its neighbor router when a network statement is added to the eigrp instance.The neighbor is a 3825 router.
Both the switch and the router have a common network which is 192.168.36.0/24. Both the switch and the router are in a neighbor adjacency. Both boxes have "no auto-summ" in the routing configuration instance.
I can run debugs on both routers (debug eigrp packets) and then I can watch queries and updates when I issue "auto-summ" or "no auto-summ". Also I see a "graceful restart" for the peers when this is done.I had an expectation that when I added the network (this is just an arbitrary network for testing, which is 172.16.69.0/24). I wanted to watch this network being sent in an update to the neighbor router.When I add the above mentioned network, there are no updates packets sent from the 3750 to the 3845. I have not had success to this point trying to resolve. I have followed the Cisco document "Troubleshooting EIGRP Flow Chart", but have exhausted all it has to offer and now it is at the point where it is telling me to contact TAC.
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.
I have some c3560 with system MTU set 1546 with interface VLAN10 whose MTU size is 1546 and there is no possibility to change it to another value. and we have some cisco 2600 where I can't set MTU bigger as 1500. I have a problem in establishing the OSPF adjacency between cisco 2600 abd 3560 , the command "ip ospf mtu-ignore" is set on both side but it doesn't work - the OSPF packets which are sent by c3560 are simply lager as 1500 bytes and are dropped by cisco2600.
the problem is that sometimes c7200 losses their BGP session, I would say in most cases it happens between NPE400 and NPE-G1/G2 whit error message like "session closed by a peer x.x.x.x" after some seconds BGP session goes again UP , and then after some minutes again DOWN .
it can be MTU problem, as the traffic passes those c35660 with MTU1500. The neighbour status showes that "transport tcp path-mtu-discovery" is enabled an all neighbours but it seems doesn't work. if I disable the path-mtu-discovery on the neighbours - the BGP session between them stays stable.
What is the log output that I should be seeing with "log adjacency changes" configured? Should I only be seeing LOADING to FULL and FULL to DOWN? I do not have "log adjacency changes detail" configured on an ASR9000 but I receive these state change messages that include EXSTART to DOWN and DOWN to DOWN.
RP/0/RSP0/CPU0:Mar 20 09:25:49.141 EDT: ospfv3[1021]: %ROUTING-OSPFv3-5-ADJCHG : Process 6000, Nbr 104.255.45.102 on GigabitEthernet 0/2/0/1 from LOADING to FULL, Loading Done
I have a IBM 6400 printer that is connected to our cisco 3750 switch and the problem is that every 5 to 10 min the printer drops off the network.Testing that I have conducted is the following:
Attached a small unmanaged switch to the port that is connected to the printer and connected the printer as well as a laptop to the unmanaged switch. The printer again loses connection to the network after 5 to 10 min. Connected the printer and the laptop to the unmanaged switch, but this time did not connect it to the network and the printer stayed online.
I have had IBM come in and update the printer firmware, but this has not fixed the issue either.The printer has a static IP and we are not seeing any other issues with devices except for this printer. The IBM techs are scratching their heads and pointing to the network as the problem. While from my testing I have to agree, but I cannot see what is causing the issue. The only other thing I can think of it would have anything to do with is the MAC address time or perhaps the ARP timeout. I am just having a tough time identifying the root issue and further testing.The network is pretty flat and is only a /23. Being that it is all local to the LAN routing should not be a factor, but I am willing to try anything to get this issues addressed.
I have a IBM 6400 printer that is connected to our cisco 3750 switch and the problem is that every 5 to 10 min the printer drops off the network.
Testing that I have conducted is the following: Attached a small unmanaged switch to the port that is connected to the printer and connected the printer as well as a laptop to the unmanaged switch. The printer again loses connection to the network after 5 to 10 min.
Connected the printer and the laptop to the unmanaged switch, but this time did not connect it to the network and the printer stayed online.I have had IBM come in and update the printer firmware, but this has not fixed the issue either.
The printer has a static IP and we are not seeing any other issues with devices except for this printer. The IBM techs are scratching their heads and pointing to the network as the problem. While from my testing I have to agree, but I cannot see what is causing the issue. The only other thing I can think of it would have anything to do with is the MAC address time or perhaps the ARP timeout. I am just having a tough time identifying the root issue but how to do further testing.
The network is pretty flat and is only a /23. Being that it is all local to the LAN routing should not be a factor, but I am willing to try anything to get this issues addressed.
Our remote 881s are running ospf with the DMVPN headends. Recently, I've been testing a couple 881s using eigrp. I've configured eigrp on the headends so I can test the 881s using eigrp. They seem to be fairly stable and are getting all the redistributed routes from ospf but, I've noticed when I show the eigrp neighbors the uptime will indicate that it is resetting every so often. Sometimes the routers that are using eigrp have a uptime of 12 hours and some will resett after a couple of hours. So, I started logging. [code] why I could be losing the adjacency and then getting it back right away?
We have a switch that, when configuring auto qos on and edge port facing video equipment, the upstream port channel drops. I was wondering if no auto qos would have to be configured on the member ports of the port channel prior to enabling auto qos on any other ports.
We are testing a new 1Gbps WAN circuit between 2 sites. We have cisco 3750 and 4507 on each end. Every time we run extended ping sweep ranging from 36 to 18024 bytes the packets are being dropped randomly once the size goes above 1500 bytes. Our ISP claims Demark to Demark test are clean and they don't want to acknowledge the problem, they blame our switches. To prove the problem is not on our end we've put different switches at each end, still facing the same issue. Ping success rate is around 98 to 99 percent.
I am little confused about the location of FIB table and adjacency table in both cisco 6500 series and fixed ports switches .In case of 6500 series switches
"Central CEF mode:The CEF FIB and adjacency tables reside on the route processor,and the route processor performs the express forwarding. Use this CEF mode when line cards are not available for CEF switching, or when features are not compatible with distributed CEF."
If line cards do no support CEF, then FIB and adjacency tables are built and are located on route processor( control plane ). Data plane operations are implemented in software and route processor performs those operations.
Some Cisco switches actually use different hardware to control the different planes. For example, the Cisco Catalyst 6500 is a modular switch that uses the Multilayer Switch.Feature Card (MSFC) for control-plane operations, and the supervisor Policy Feature Card (PFC) for the data-plane operations.
Supervisor module has has MSFC and PFC. MSFC implements control plane operation where as PFC implements data plane operation.But the first paragraph says in Central cef mode, both data plane and control plane operations are implemented by route processor. [code]
Do these switches implement the Central mode cef in same way as mentioned above. i.e
"Central CEF mode:The CEF FIB and adjacency tables reside on the route processor and the route processor performs the express forwarding. Use this CEF mode whenline cards are not available for CEF switching, or when features are not compatible with distributed CEF."Or fixed ports switches such as 3750 implement data plane operation in hardware where FIB tabe and adjacency table are maintained on Data plane.
I have a test on eigrp next week and have been doing it in packet tracer so i`m ready but i can`t seem to get EIGRP to work!I have 3 routers and the loopback interfaces are configured because there`s not enough PCs to actually connect up to the kit. [code]
I have a issue in my network, i have 2 data connections with 2 different ISP (Principal & Backup connection). But with ISP "X" the RTO are stable (RTO 240), but with the ISP "Y" the RTO is in 5000 and the connection always are flapping.
I have recently connected a 10 Gig connection from the local telco between two sites on 6509's. These two sites also have a 1 Gig links between them. When I connected the 10 Gig link I expected the 10 gig link to be the preferred route, but after looking at the routes I noticed that both links have the same EIGRP path cost. Also the minimum BW for both links is 1000000Kb or 1Gb. Why?
We have 2x 3750G L3 switches and I am trying to set them up to use EIGRP but for some reason it’s not working, I created 2 routed ports on each switch and I want to route vlan10 traffic to vlan20 to S2. I also enable EIGRP as the routing protocol but I still cannot ping between VLAN 10 and VLAN20 , here are the configs for both switches. What am I doing wrong?
Current configuration : 1943 bytes
! version 12.2 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! [Code]...
Our customer wants load-balance across unequal circuits due to the primary link being saturated. Primary link is 10Mb and backup is 4mb (multilink 2 x 2Mb).
I have tried implementing this using ‘variance’ under EIGRP on the 6500 switch but can’t seem to get both WAN routes in the routing table - unless I use the same metric on the route-maps we use for redistribution – e.g. set metric 10000 100 255 1 1500
If I do this the 6500 sees both routes but I’m concerned too much traffic will go via the lower speed link causing more problems. I have adjusted the delay under redistribution to make the 4Mb less preferred and I see this under ‘show ip eigrp top’ and thought the ‘variance’ command on the 6500 switch would work. But no matter what I set variance to it still doesn’t enter the less preferred route in the routing table.
I config the routers with EIGRP and also write Static route between two PC before remove the link between router0 and router1 , destination is reachable , but when remove this connection , packet from pc1 to pc0 will drop in a loop and never reach to destination , is it possible to have a Link state routing protocol and static route at the same network like this scenario , how to prevent loop in this topology static route is configure as bellow :
I have been playing around with Packet Tracer trying to understand EIGRP and to put it into practice. Well im not doing so well, I cant get the routers to form an adjacency therefore nothing is pinging outside of the routers. [URL]
I started studying yesterday for CCNP Route and I'm already stuck. Stupid Frame relay. Basic topology attached, 1 Hub, 2 spokes. I have EIGRP working correctly and each spoke can see all routes correctly. The Hub is on a Multipoint interface with split horizon turned off.
