Cisco WAN :: EIGRP Passive Interface With 3750

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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Effectively Use Of Passive - Interface Fa0 / 0 Command

Apr 29, 2011

I don't really know how this things work, but somehow i know that when you summarized few subnets into 1 in RIPv1 protocol in router, you would need this command, but how this things actually works?

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Cisco WAN :: 7600s / Auto Add Of Subinterfaces As No Passive-interface In OSPF?

May 29, 2011

I've been having a problem with my cisco routers (7600s) where sub-interfaces that we create for ldp tunnels are added automatically to the main ospf process as no passive when created. In order, here is how to reproduce the issue:
 
- Configure ospf process as "passive-interface default"

- Configure interfaces that have to be active as "no passive-interface blah"

- ospf works as expected.

- Create new sub- interface somewhere with encapsulation on a certain vlan for xconnect.

- New sub-interface gets added as "no passive-interface" in main ospf process.

- When adding a new port-channel interface, behavior is the same.
 
Is that normal for cisco, should I continue removing sub-interfaces manually every time from the ospf process?

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Cisco Firewall :: ASA 5520 - Interface Reconfiguration In Active / Passive Failover

Dec 20, 2011

Currently l have two ASA 5520's in a active/passive failover scenario.  Currently the interfaces for the inside and outside are fixed at 100/FULL.I want to repatch them into GigE ports setup as Auto Negotiate.Is there anyway of keeping the connections through the firewall active in this type of scenrio or will l have downtime disconnecting and repatching?  or could l possibly disable failover and reconfigure each ?

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Cisco Switching/Routing :: Nexus 7010 OSPF Passive-interface Default Not Showing

Nov 6, 2011

I'm currently working on a plan to migrate our 6500's over to our new 7010's.  At the time of the migration I want to tighten up our OSPF design and configure OSPF for "passive-interface default" then allow only those interfaces that should have OSPF neighbors to send the hellos.  The issue is that the command is not showing up under the OSPF process.  What's even more interesting is that the Nexus 5.x Unicast Routing Configuration Guide shows that the "passive-interface default" command should be an option to enter.
 
I'm currently running version 5.1(4) (though looking to upgrade to 5.2 during my migration testing).  I would rather configure the passive-interface via the routing process versus having to enter it on every interface.

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Cisco WAN :: 3750 EIGRP Adjacency Dropping

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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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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Cisco WAN :: C2921 - EIGRP Flapping Through Sub Interface

May 8, 2012

I get some EIGRP flapping on my CE router (c2921) 2 sub interface to another two site. The router IOS version "c2900-universalk9-mz.SPA.152-2.T1". I capture the debug log as attached. I know understand some log meaning from the debug.

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Cisco WAN :: 3750 L3 / EIGRP Load Balancing While Running HSRP?

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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Cisco WAN :: 3750 EIGRP Session Flapping For Seconds / Minutes

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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Cisco Switching/Routing :: 3750 - Enable EIGRP Process

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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Cisco WAN :: EIGRP Not Fully Passing Routes After Introducing 3750

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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Cisco Switching/Routing :: EIGRP Default Route 3750

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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Cisco Switching/Routing :: 3750 Redistributing A Static Route Into EIGRP

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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Cisco Switching/Routing :: 3560x Configure EIGRP On ASA DMZ Interface

Aug 2, 2012

I am trying to configure EIGRP on my ASA DMZ Interface - topology as follows: [code] The ASA is currently configured for EIGRP with the inside 3560x switch and passing routing updates properly.However, the ASA will not send/receive routing updates to/from the DMZ 3560x switch - the two devices do establish eigrp neighbor relationship. [code]

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Cisco Switching/Routing :: 3750 / EIGRP Router Won't Update Neighbor With New Network

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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Cisco Switching/Routing :: Does 3750 / 3560 Switch Support Eigrp Or Ospf

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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Cisco Switching/Routing :: 3750 Switch - Eigrp Stub Static Redistributed Command Executable?

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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Cisco :: 3750 - How To Make Interface VLan

Mar 19, 2012

i have linksys modem which already working for different v lans then for lab we take other switch 3750 switch and created different v lans. v lans are working fine but we need internet for different v lans for that linksys modem how we can make interface V lan1/

ip address 10.1.1.10 255.255.255.0
ip default- gateway 10.1.1.1
no sh
interface Vlan10
ip address 10.1.2.1 255.255.255.0
no ip route-cache
!!interface Vlan20
ip address 10.1.3.1 255.255.255.0
ip route 0.0.0.0 0.0.0.0 10.1.1.1
ip dhcp pool vlan10
network 10.1.2.0 255.255.255.0
default-router 10.1.2.1
dns-server 10.1.1.1
!
!ip dhcp pool vlan20   network 10.1.3.0 255.255.255.0   default-router 10.1.3.1   dns-server 10.1.1.1

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Cisco :: Use EEM To Report On Interface Up / Down 6509 And 3750?

Sep 6, 2011

I have just started to discover the power of EEM and am already monitoring config changes on our switches with EEM.I would like to be notified of any interface going up and possibly down. on our 6509's and 3750's This is just to be aware of anyone patching anything in.

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Cisco WAN :: 3750 - Backup Interface Support On ASR

Jun 20, 2011

Does backup interface is supported on ASR? 

interface GigabitEthernet0/2/1
description 3750_Stack_1
backup interface GigabitEthernet0/2/2
ip address 100.50.50.242 255.255.255.248

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Cisco Firewall :: Web Authentication On Layer 3 Interface With Cat 3750

Sep 12, 2012

Cisco 3750 with IP Service Image 12.2.55, Trying to enable Web Authentication on Layer 3 interface:
 
!
ip auth-proxy name bp_auth_proxy http inactivity-time 60
!
interface GigabitEthernet1/0/5
no switchport
ip address 192.168.1.27 255.255.255.0
ip access-group 101 in

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Cisco WAN :: 3750 - How To Configure Backup Link Into Switch Interface

Jan 18, 2011

I have two 3750 switch.switch A(main) and switch B is connected by OFC but i have another wireless link for backup.Now if OFC goes down then i manually connect wireless link with switch B  for this reasons i am faceing a lot of problem. I want without any changing of cable if my primary link goes down then my backup link automaticaly goes up and vice versa .
 
Switch-A port gi1/0/9 and Switch-B port gi1/0/9 is connect by OFC Switch-A port gi1/0/8 and Switch-B port gi1/0/8 is connect by Wireless link (backup) i attach my network diagram kindly find the attachment file.

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Cisco WAN :: 3750 / Retrieve Tengig Interface Serial Numbers Via CLI?

Jun 13, 2011

it's possible to retrieve Tengig interface serial numbers via CLI?  We have a couple of them in 3750 switches, and we need them for our inventory.

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Cisco Switching/Routing :: Interface Numbers On A 3750 Switch?

Jul 31, 2012

Is there a way to change interface numbers on a 3750 stack but, still retain the config of the physical port?
 
For instance:
 
I would like to take the top switch, which has the ports numbered g2/0/1 - 52 and change them to be g1/0/1 - 52. And the bottom switch, which has ports numbered g1/0/1 - 52 and change them to be g2/0/1 - 52. Basically, just swap the interface numbers but, not effect any interface configurations.

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Cisco Switching/Routing :: 3750 Show Interface Options

Jan 16, 2012

I'm troubleshooting a 3750 switch stack problem where computers are showing input and CRC errors.  I'd like to be able to execute a "show interface" command that will show me only the line showing the switch port and the line showing the input errors, but so far I can't figure out a way of combining those two parameters. 
 
If I do "show interface | include Ethernet[0-9]�" I get all the lines showing the port numbers:
 
GigabitEthernet1/0/1 is up, line protocol is up (connected)
GigabitEthernet1/0/2 is up, line protocol is up (connected)
GigabitEthernet1/0/3 is up, line protocol is up (connected)

[Code].....

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Cisco WAN :: 3750 - Establish Interface Dialer On Layer 3 Switch?

May 7, 2012

Is it possible to establish a interface dialer on a layar 3 switch?Or is it only interface for routers?I have a c3750 switch (WS-C3750G-24T), and when i try to establish a dialer interface i get an error message:

[code]...

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Cisco Switching/Routing :: Cannot Set Route-map On Interface Vlan In Non Default Vrf On 3750

Dec 12, 2012

Cannot set route map on interface vlan. which in non default vrf on Cisco 3750.IOS c3750-ipservicesk9-mz.122-55.SE.bin sdm prefer route in enable ip vrf users rd 200:0 route-target export 200:0 route-target import 200:0 interface Vlan201 description Users 1 ip vrf forwarding users ip address 10.31.76.1 255.255.252.0 ip helper-address 10.31.4.57 route-map fromuser permit 10 match ip address fromuser set ip next-hop 10.31.128.155 When I enter "ip policy route-map fromuser" to interface Vlan 201 I heve the message:
 
% Remove VRF configuration from interface Vlan201 first

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Cisco Firewall :: 3750 / ASA 5510 - Allow Access To Server On Inside Interface From DMZ?

Feb 28, 2013

My internal network consists of Catalyst 3750 switches segmented into different VLANs.  There is a default route on the layer 3 Catalyst switch sending all unknown traffice to the inside Internet of the ASA 5510.  However, I'd like to have a separate VLAN for wifi guest access and send all of that traffic through one of the DMZ interfaces on the ASA 5510.  I don't think you can have separate default routes based on VLANs on the 3750 switches so my only option is to make the ip address of the DMZ port the default gateway for all hosts on the wifi guest VLAN. 
 
The problem I have is that I have a couple servers behind the inside interface that have services available to the public Internet via a NAT address on the outside interface.  I want the guests on the wifi VLAN to have the ability to access the servers on the inside interface using the public address as well, but have not been able to come up with a solution yet. 
 
Here is my config that pertains to this setup:
 
interface Ethernet0/0description Outside Interfacenameif Outsidesecurity-level 0ip address 76.47.10.x 255.255.255.224 rip send version 1rip receive version 1!interface Ethernet0/1description Inside Interfacenameif Insidesecurity-level 100ip address 192.168.17.1 255.255.255.0 rip send version 1rip receive version 1!interface Ethernet0/3description Wifi Guest Accessnameif DMZ2security-level 50ip address 192.168.60.1 255.255.255.0
 
global (Outside) 1 interface
nat (Inside) 0 access-list nonat
nat (Inside) 1 0.0.0.0 0.0.0.0
nat (DMZ2) 1 0.0.0.0 0.0.0.0
static (Inside,Outside) 76.47.10.x 192.168.17.88 netmask 255.255.255.255
 
I've tried the following commands below but no dice. 

same-security-traffic permit intra-interface
static (inside, inside) 76.47.10.x 192.168.17.88 netmask 255.255.255.255

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Cisco Switching/Routing :: 3750 Interface Total Output Drops Incorrect

May 15, 2011

I am seeing Interface output drops that appera to be incorrect.  When I do "Show Interface gi1/0/20", I will get interface output drops of "4294961382".  But, when I do the same command again it shows "0" drops.  Is this a reporting error? I am ruinning c3750-ipservicesk9-mz.122-58.SE.bin on a 3750 stack with 2 switches in the stack. [code]

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Cisco Switching/Routing :: Catalyst 3750 Switch Interface Output Drops

Mar 13, 2013

One of my Catalyst 3750 switch have many out drops, I execute "sh mls qos int g2/0/3 statist" command, there are many output drops in queue3 threshold3. [code]

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Cisco Switching/Routing :: 3750 Switch - Routed Interface / Traffic Composition

Feb 21, 2012

On a router I can use IP Accounting or Netflow to see what kind of traffic is moving over an interface.  Are there any tools on a 3750 switch with a routed interface which would tell you who is hogging the bandwidth on that interface?

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Cisco Switching/Routing :: Configure Port-Channel Or Physical Interface On 3750

Jan 12, 2012

how to configure this. I did it in the past but kind of forgot how I did it.I have a stacked 3750 (two physical switches) connecting to a 2960.
 
I am creating trunk ports with limited access to VLAN 300, 600, and 700.
 
There is two interfaces connected from the 3750's(one on each physical stack member) to the 2960.I have the physical interfaces configured exactly the same.
 
3750 Config:
 
interface Port-channel2
!
 interface FastEthernet1/0/46
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1, 300,600,700
switchport mode trunk
speed 100

[code]....

Should I keep the configuration on the physical ports and not configure the Port-Channel Interfaces? Do I need to configure port-channel load balancing? Is the channel-group mode sufficient? Goal is to basically create 2 links to the 2960 to double the bandwidth and provide redundancy.

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