Cisco WAN :: 3750 / EIGRP Stub At The Edge?
Apr 24, 2012
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.
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Sep 16, 2012
we have 5 sites connected with a combination of direct fiber and Service Provider Ethernet. The equipmet consists of 3750 stacks with IP Services. Currently each site runs full EIGRP and is a EIGRP neightbor to all the other sites. Everything is working fine right now.
We would like to upgrade the R5 site to a 3750x stack with IP Base (cheaper than IP Services) and configure it as EIGRP Stub. My concern is with the following statement in the IOS command reference guide.
Note Multi-access interfaces, such as ATM, Ethernet, Frame Relay, ISDN PRI, and X.25, are supported by the EIGRP Stub Routing feature only when all routers on that interface, except the hub, are configured as stub routers.
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Feb 29, 2012
On 3750 switch with IOS c3750-ipbasek9-mz.122-55.SE4.bin "eigrp stub static redistributed" command will be executable ?
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Feb 13, 2013
I have a 3560 with IP base that is acting as a true EIGRP stub router today. It advertises local routes to the upstream service provider router and receives a default route.
Now I want to connect a 3900 ISR as a voice gateway. The 3560 does not seem to be advertising any routes to the 3900. Ok the EIGRP stub doc says this:
Only specified routes are propagated from the remote (stub) router. The router responds to queries for summaries, connected routes, redistributed static routes, external routes, and internal routes with the message "inaccessible." A router that is configured as a stub will send a special peer information packet to all neighboring routers to report its status as a stub router.
# Any neighbor that receives a packet informing it of the stub status will not query the stub router for any routes, and a router that has a stub peer will not query that peer. The stub router will depend on the distribution router to send the proper updates to all peers.
I guess I don't understand why the stub advertises local routes to the upstream ISP router but does not seem to advertise routes to the 3900. Does the stub identify the ISP router as the distribution router somehow, thus differentiating it from the 3900? If so, how is this done?
show ip eigrp neighbor detail on the 3900:
EIGRP-IPv4 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
[Code].....
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Jan 15, 2013
I have A 3560x running 12.2(58)SE2 and jus tupgraded to IP services to allow Enhanced EIGRP as found on feature navigator. I need to run full EIGRP and disable Stub.
however, when I try to disable it, I get this error:
dist2-3560x(config-router)#do sho licenseIndex 1 Feature: ipservices Period left: Life time License Type: Permanent License State: Active, In Use License Priority: Medium License Count: Non-Counted
Index 2 Feature: ipbase Period left: 0 minute 0 second Index 3 Feature: lanbase Period left: Life time License Type: Permanent License State: Active, Not in Use License Priority: Medium License Count: Non-Counted
dist2-3560x(config-router)#no eigrp stub connected summaryEIGRP is restricted to stub configurations only on this platform.
I have installed the license and rebooted. by all indications th elicense is installed and should allow for Full EIGRP routing.
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Nov 14, 2012
We have small which I'm looking to implement and have built this on GNS3.
We have:
Router A in site 1
Router B in site 2
Router C in site 3
Router A and B are connection via a point to point 100M link and from Router C we have a 2 point to point one of which is 5Mpbs and going to Router A and Router B.
For Router C to reach Router A network it will go via Router B and these are 100M connection. When the link between Router A and B goes down. Router C should update and start using the 5m route.
For some reson, the routes are not updating. I have to do 'clea ip eigrp ne' for the routes to update and if I reload the routers all works well, it seems the problem is intermittent.
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Dec 17, 2012
We are experiencing some issues with the Apple TV and WLC. We currently have a Apple TV and iPhone same sub net connecting via Lightweight AP (different sub net) which connects to a Cisco3750 running IP Base. This connects to WAN routers managed by third party over a WAN and connects to far end Managed routers, these connect to other Cisco3750 IP Base and onto a 2504 Wireless LAN controller. We have used the the following document for WLC configuration; [URL]
We turn on Multicast globally, with IGMP snooping enabled also enable Multicast Multicast under controller (only option available on 2504) and give the device M Cast address 239.21.1.150 . The P2P blocking action is disabled. Going to Monitor Multicast we can see the Report for 224.0.0.251 and MGID. However the issue is at the Sender Receiver side the iPhone cannot see the Airplay on the iPhone that should be seen if the end to end stream is working. My focus is now on the Cisco3750's, although I do not totally understand why the device needs Multicast enabled as the Multicast Join and Group Traffic is encapsulated in the CAP WAP Tunnel is it not? Anyway I have enabled the only option "ip multicast routing distributed" and under the V LANs that connect to WLC and AP the only option available is the "ip pim passive" there is no "ip pim sparese-dense mode"
I am sure the WLC is configured correctly, but I suspect that this will not work due to the IP Base image on the 3750's not being able to run full multicast or we need to use uni cast for this solution that the 2504 does not support.
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Mar 29, 2011
I have a very basic networking question If I have, say, 3750's (or any L3 switch, capable of routing) at the edge and a 4500 at the core, where should I route? At the edge? At the Core? Both?
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May 13, 2012
I need to make some changes on our network. We currently have two sites 150 miles apart we join both by way of fiber and on each side we have Cisco 3750 stack switches, configure trunking for all V lans on one port in site one then through the the long haul fiber to site two with site one using 10.1.1.30 and site two using 10.1.1.40 as their default gateway, with static routing all V lan sub nets to the other sites default gateway life is good.
My question - seeing how we have sites using the same sub net 10.1.1.x to trunk all data to each site through switches; we need to now change the network and add each site to the MPLS network, site one switch 1 IP address 10.1.1.30 going to MPLS router one with FA0/0/0 using IP 10.1.1.31, site two having switch 1 IP address 10.1.1.40 going to MPLS router one with FA0/0/0 using 10.1.1.41. I need to know will this work.
We have the same sub net in each site 10.1.1.x to the MPLS routers then the external router interface connecting each site to local switches, will this cause any problems by using the same local sub net for each site?
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Jan 10, 2013
I've been fighting what seems to be an increased number of outqueue drops on our core stack and edge switches for the last 3 or 4 weeks.(The core consists of a stack of 5 3750s in 32-gig stack mode. The wkgrp switches are 3560s. all are at 12.2.52) The wkgrp switches are directly connected to users. We use Nortel IP phones with the phone inline with the user PC. auto-neg to 100/full. [code] However I have tried turning off QOS on a couple of workgroup switches (no mls qos, but left individual port configurations the same) but am still seeing drops.Since I have disabled qos on the switches in question (no mls qos) (not the core tho) I am presuming these commands have no affect on the switch operation and therefore cannot be related to the problem. With QOS turned off one would presume that it is general congestion - especially at the user edge where busy PC issues might contribute. So I wanted to see if I could see any instances of packets in the output queues building up.
I wrote some scripts and macros that essentially did a snapshot of 'show int' every 20 seconds or so, and looked for instances of 'Queue: x/' where x was greater than zero.What I found after several days of watching the core stack, and a few of the workgroup switches that are most often displaying the behavior, was that I NEVER saw ANY packets in output queues. I often saw packets in Input queues for VLAN1, once in a great while I would see packets on input queues for fa or Gi interfaces, but NEVER on output queues. [ code] Additionally, when I look (via snmp) at interface utilization on interfaces showing queue drops (both core and wkgroup), they are occurring at ridiculously low utilization levels (as low as 4 to 8%). I've tried to look for microbursts between the core and a wkgroup switch where the core interface was experiencing drops, but haven't seen any (using observer suite). [code] While the queue-drop counts aren't critically high at this point, they are happening more frequently than in the past and I would like to understand what is going on... In most cases, no error counters are incrementing for these interfaces. Is there some mechanism besides congestion that could cause output queue drops?
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Mar 3, 2013
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.
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Apr 26, 2011
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.
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Dec 15, 2010
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?
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Apr 9, 2013
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]
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Sep 23, 2012
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:
6500:
router eigrp 1
redistribute static
network 10.0.0.0
network 172.16.0.0
network 172.17.0.0(code)
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Apr 8, 2013
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]...
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Jun 20, 2012
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.
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Feb 13, 2013
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]
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Apr 18, 2012
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.
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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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May 28, 2008
I'm swapping out a PIX, IOS 6.3 with an ASA 5520 v8. The PIX has the following 2 commands in it's config:
multicast interface outside
multicast interface inside
These commands do not exist on the ASA. I do not wish to enable multicast routing. What commands on the ASA are equivalent to the multicast commands on the PIX?
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Jun 26, 2011
I can't seem to find where in ASDM (6.4.1), can we configure IGMP forwarding? ASA5520(config-if)# igmp forward interface outside The ASDM doc reference does not seem to be correct pointing to:configuring Stub Multicast Routing
Step 1 In the main ASDM window, choose Configuration > Device Setup > Routing > Multicast > IGMP.
#Step 2 In the Multicast pane, check the Enable Multicast routing check box.
#Step 3 Choose MForwarding.
which generates:
ASA5520(config-if)# mfib forwarding
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Mar 6, 2012
our customer has a server farm in a data center.At the moment the farm has connectivity with only one ISP but sometimes it has service discontinuity.Customer wants to become AS and having two ISP connectivity for backup purposes.He needs to evaluete two cisco routers to use at AS edge with BGP.At the moment he says that the throughputh with the server farm is max 15Mbps and in the future he thinks that it will not increase.We think about cisco2951 routers with 2GB ram.Is cisco 2951 adeguate for this task ?
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Sep 15, 2011
If my ISP brings ethernet into the building via duplex LC multimode fiber can I use the ASA5550 as the first device from the WAN or do I need some type of router for this? I realize I'll need an SFP to get to duplex LC, but I'm not sure if I need a router, or if the ASA can function as a router for this application.
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Dec 18, 2011
If my ISP brings ethernet into the building via duplex LC multimode fiber can I use the ASA5550 as the first device from the WAN or do I need some type of router for this? I realize I'll need an SFP to get to duplex LC, but I'm not sure if I need a router, or if the ASA can function as a router for this application.
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Oct 7, 2011
My company's spent the last few weeks struggling with an issue with their VPN backups where select packets were being lost.
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Apr 9, 2011
How to configure an Asa that will have a default gateway to an edge router that will be doing PBR? We would like Internet surfing to go out one ISP while internally hosted services in the Asa DMZ would go through the other ISP. configuration examples for both the edge router and the Asa?
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Nov 26, 2011
I'm trying to figure out the best design for my network. I currently have a setup like this:Internet - Cable Modem - Pix 515E (doing NAT) - 2621 - Internal Network.Now, should I have the 2621 as my edge device or the Pix?
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Jan 21, 2013
I have a 2504 WLC with a 1042 AP and I have it placed on my edge Cisco 3750 switch. I have the management interface of the WLC set on my WAN IP 71.x.x.x subnet range, and I have the WLC doing DHCP duties with a DHCP scope of 192.168.X.0. I have my DNS servers set on external DNS servers out on the Internet.I have two Cisco 3845 Routers on my edge network - one for each ISP with BGP protocol.
Since my native VLAN is 71.x.x.x, I added a sub interface on my main core router and gave it a 192.168.x.1 255.255.255.0 address for the gateway. Also, I added ip prefix-list iBGP seq 10 permit 192.168.x.0/24 le 32 to my main core router. On my secondary ISP router I added ip prefix-list iBGP seq 10 permit 192.168.X.0/24 le 32, and ip prefix-list OUT seq 10 permit 192.168.x.0/24 statements.
I added VLAN 10 to my edge switch and gave it IP 192.168.x.2 255.255.255.0, and the switchports that my core router and my WLC are connected to the edge switch, are in trunk mode with encapsulation dot1q 10. The switchport on my edge switch that the AP is connected to is in switchport access mode.
I can connect to the wifi with a 192.168.x.x IP address on my laptop, but I cannot get any Internet access. Is it possible to have the DHCP scope be in a different subnet than my WAN IP subnet, and allow guests to get to the external Internet only? Do I need to put the WLC somewhere internal on my network i.e. the DMZ and then tunnel the traffic out to the Internet with no Internal network access?
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Nov 19, 2012
We have two 6509 will active/passive sup 720-3BXL cards in each and 1GB DRAM. Each handles full bgp routing table with 4-5 ISP(eBGP) connections. The problem we are facing is.. 6509 were meant for core/aggregation and seam to be wasted are edge devices. With each ISP added the DRAM creeps up to a point were is it 80% utilized.
I am looking to replace both 6509's with routers which were meant to work on the edge. As mentioned earlier, it will have 4-6 external bgp peers per router. Handle full bgp tables. Should be capable of policy based routing.
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Feb 20, 2012
setup the Physical connectively of IPS 4240 on the Internet edge with the ASA 5520, how the topology will be
f this a good design with IPS Appliance at nternet Edge
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Dec 22, 2011
We are replacing a DS3 Internet connection with a 100 Mbps fastE connection from a Tier 1 Provider. I currently have a Cisco 7204VXR with 512 Mb DRAM and 128 Mb of Flash and two 10/100 ports that is connected to the DS3. I also have a 3845 with 1 Gb of DRAM and 256 Mb of Flash with two 10/100/1000 ports available.
We are currently running BGP, below is the summary
BGP table version is 88880414, main routing table version 88880414
379041 network entries using 44347797 bytes of memory
379043 path entries using 19710236 bytes of memory(code)
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Nov 15, 2005
How to successfully implement OER w/ NAT? I will have an 1841 with the 4-port EtherSwitch module that will have 3 cable modems connected and utilizing cisco's OER to utilize all 3 links for outbound Internet traffic. However, I am concerned about NAT. The only other interface used on the 1841 will be the connection to the local LAN (inside). I'm thinking this will require a loopback, but I'm not finding anything on CCO to back me up. Is it possible to just let the CMs do NAT? 1 CM is a static IP and the 2 others are DHCP.
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