Cisco WAN :: 3750s / Switch Stack Or HSRP?

May 9, 2011

I just inherited a network which has 7 switches (3750s) as a Stack. In there, there are 5 SVI (switch virtual interfaces) and in each of these VLANs, HSRP is configured.
 
Question:Is HSRP really needed in a Stack configuration?If so, what are the benefits?Can I simply clean-up the config and remove HSRP? 

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Cisco Switching/Routing :: 7000 / 3750 Stack - HSRP Between ISPs Router And L3 Switch

Dec 27, 2012

We have our WAN setup as explained in the attachment herewith. As of now, We have a IP 1 configured as HSRP IP in the LAN switch end at Site A and Site B. As per the HSRP priority, Site A's WAN router will preempt to be the Active WAN router. 1*1Gig link at both DCs connect to the respectve WAN router.
 
But with this setup, we experience a WAN outage whenever there is a link disconect at Site A - as HSRP fails over from Active to Standby(Site B) and again when the link at Site gets restored. To avoid this :
 
Is it possible to have the HSRP configured over a port channel at Site A and B (or atleast at Site A) ? In that case, will there be a need for the ISP to change their configuration except to configure a port channel ? The ISP has Cisco 7000 series router which connects to 3750 stack at DC lan.

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Cisco WAN :: L3 Etherchannel Between 2 Connected 3750S And Stack Of 2 3750?

Jun 5, 2013

i was just asking if it is possible to create a L3 etherchannel between 2 single 3750 switches that act as our core, (running HSRP for the vlan and with a port-channel between the two) and a new switch stack of 3750s that will be routed to and managed by another party. Only i'd like to have the redundancy of 2 links connecting the new stack.If it is possible are there any best practices or preference in using PAgP or LACP or just going for ON.

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Cisco Switching/Routing :: Running HSRP On The Same 3750 Stack?

Oct 9, 2012

I have a 3750 stack and want to confirm if I can run HSRP on the stack to two different ASR routers for redundancy purposes ?
 
It looks like the below :-
  
   --------------------------------
   |     SW1          SW2  |
   |       3750 Stack        |
   |------------------------------- |
            |          |
            |          |
     -----------     ------------
    |    P     |   |    S      |
    |  ASR1 |   |  ASR2  |
    | ______|   |_______|

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Cisco Switching/Routing :: Dual Stack HSRP On 3750X?

Jan 10, 2013

I would just like to confirm whether dual stack hsrp is possible or not on 3750X both stack and non-stack.
 
The following is that I have to take care of this on the stack?
 
[Catalyst 3750 Software Configuration Guide, Release 12.2(55)SE]

[URL]
 
%FHRP group not consistent with already configured groups on the switch stack

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Cisco Infrastructure :: 2960s / 3750s / 6506 - AC Power Outlet On Catalyst Switch

Apr 15, 2011

I have several 2960s and 3750s and two 6506 (ws-cac-3000w) recently move to new location The  power outlet is the same ,but Volt is different current 2960/3750 use this(one phase 3 wire) 220v and new location  change to (from 3 phase 4 wire -> one phase 220v)6506 current using(one phase 3 wire) and will be change to (from 3 phase 4 wire -> one phase 220v)

 I had search doc about power supply /cable ,  only show support single phase 220 v ,but not description  vlot between each wire !!Does new location power outlet suit for 2960/3750s power and 6500 ws-cac-3000w ?!? Do I need chane power outlet back to current using?

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Cisco Switching/Routing :: ISP HSRP With ASA 5510 Failover And Switch Selection?

Feb 27, 2013

I have two Cisco ASA 5510s that I would like to configure in an active passive failover setup.  The ASAs  are at the top of our rack and handle all our routing.  We have been  only using one ASA unit with one line from our ISP connected to the WAN/outside interface of the ASA.  We recently had our ISP setup two lines into our rack using HSRP.  I do not know what equipment they are running upstream of our ASAs but it is HSRP so it should be a set of Cisco routers/switches.  Originally I thought I could just connect the 2nd new line to our 2nd ASAs WAN/outside port and setup failover using a crossover cable between the ASAs.  After doing this config I had problems accessing some of our IPs in the subnet that the HSRP is part of.  If I disconnected the 2nd ASAs  WAN/outside line everything was fine.  After talking with my ISP they  explained that I need to connect both of my lines into our L2 network  and then from there into the ASAs. Currently below the ASAs I have two Catalyst 3560-X switches.  They are connected together with an ISL trunk and ASA-1s inside network connects to switch-1 and ASA-2 to switch-2.  One idea was to connect each of the HSRP  lines to each of my current switches and then from the switches to the  ASA's WAN/outside interface.  Finally back down from the ASA's to the  switches via the inside interface that we have currently.  This kind of  seems messy and a poor choice.  The other idea is to get two switches that would sit above the ASAs and connect the HSRP lines to them with the switches connected together.  They would then connect to the ASAs.  I like this idea better but I don't like having to buy two more full switches for this.  These switches would only use a couple of ports and only handle just the HSRP ISP lines to the ASAs.  Putting in two more 3560-Xs  would be a big waste of money and space for this.  So I was thinking of  using two Cisco SG200-08, 8 port gigabit basic managed switches for  this. 

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Cisco Switching/Routing :: Have HSRP Or GLBP Between Two Different Switch Like 3550 And 3560?

Dec 9, 2012

Can i have HSRP or GLBP between two different switch like 3550 and 3560?

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Cisco Switching/Routing :: HSRP Group Limit In 4506E Switch?

Oct 31, 2012

I have two cisco 4506-E series switches ..
 
We are planning to go for HSRP redundancy for 32 VLANs. Means In a Cisco 4506-E switch , we will configure 32 vlans and among them 16 vlans will be primary and 16VLANs will be standby ans it is viceversa in another core-switch
 
My querie is How many standby groups can we create in Cisco 4506-E switch,
Is there any limitation..
 
If there is any limitation , can we go ahead with VRRP,GLBP? Are there any limitation in VRRP/GLBP? Is there any design related issue can we face if we use same group number to all VLANs?
 
Product details :
 
Model : Cisco 4506-E
Sup Model : WS-X45-SUP6L-E
IOS  : S45EIPBK9-12254SG

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Cisco Switching/Routing :: Difference Between Using Hsrp On Vlan And Physical Port On 3750 Switch

Nov 14, 2012

What the different between using hsrp on vlan interface and on physical port (routed port) on Cisco 3750 Switch? Wha the benefits?

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Cisco Switching/Routing :: 3550 - Unable To Ping Internet From HSRP Standby Switch

Nov 16, 2011

I have router connected to 2  3550 switches  directly. 3550A  and B  switches are running HSRP. OSPF is running between Router and 2 switches.
 
From Switch B  i can ping the Router Wan interface but not the internet sites. from Switch A  i can ping any sites?
  
Switch B 
3550SMIB#                          sh ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGP       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area       N1

[Code]......

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Cisco LAN :: Four Member Switch Stack 3750

Apr 16, 2013

We have a current 3-stack 3750 ( 48-P,48-TS & 3750v2-48PS ) running fine. There is a plan to introduce a fourth stack member ( 3750X-48P ) into this stack.as per cisco documentation, it suggests to use 3750X as master for a mixed stack. In this case, we will need to upgrade current other 3 stack switches to a latest version.,Can we do a no-downtime ios upgrade on the existing 3-switch stack?, when this upgrade is done, is there any way to have the new ios pushed down to all three stack members at the same time or do we need to each member upgrade seperately?, for adding the fourth member, is it acceptable if master is ruuning ver eg. 12.2(55) and all rest of the members run ver 12.2(53) ? will this create any issues and will stacking be successful.

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Cisco WAN :: 3750 - Stack And Switch Port Keeps Going Up / Down

Nov 7, 2012

I have 2 3750x switches connected via a pair of stackwise cables, but I keep seeing error messages about the stack&switch ports going up and down,Performance wise, it seems to work, but I'd like to eliminate this message... Sometimes it will go hours without bouncing, sometimes it does it a few times a minute....
  
*Mar  4 12:56:57.903: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
*Mar  4 13:16:48.070: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP
*Mar  4 13:16:49.093: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN
*Mar  4 13:38:55.802: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
*Mar  4 13:38:56.809: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN

[code]...

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Cisco Switching/Routing :: 3750 / Add A New Switch In Stack?

Jun 21, 2012

i want to remove an access layer 3750 48 POE master switch and replace with a  new 3750 switch in the stack. i want to copy the same configuration to new switch since the old switch is having POE issue and I got replacement of the malfunctioned switch. we have VTP domain is configured in the network...

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Cisco :: LMS 4.1 Email Alert When Stack / Switch Not Responding

Oct 31, 2012

With LMS 4.1.How do i create an Email alert when stack/switch become non responsive?

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Cisco Switching/Routing :: C3750x-48P-E Stack Switch Best IOS

Mar 27, 2013

Which is the best and advanced IOS for c3750x-48P-E stack switch among below listed IOS.
 
c3750e-universalk9-mz.122-58.SE2 ?
or
c3750e-universalk9-mz.122-55.SE6..??

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Cisco WAN :: Catalyst 3750 - Adding Switch To Stack

Mar 23, 2012

I have a Catalyst 3750 I want to add to an existing stack (same models) through the stackwise port We use some complex QoS and other features on our network, and I'm not sure how much configuration I need to do on the new switch before adding it to the stack. Since this is going into an existing setup?

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Cisco Switching/Routing :: 2960s / Add One More Switch In Stack?

Apr 29, 2013

I have a running setup having 2 Cisco 2960s 24 TS switch with Stack configuration. Now I want to add one more same Cisco switch. My questions are:-
 
1) How can I do this...(Should follow the same process as I did before.

2) Could I do this without impacting the service. i.e. without rebooting the switch.

3) What should be the connection archiecture as of now since there is two switch so it is connected 1 -1 and 2-2. but for 3 switch should we require to change the connectivity.

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Cisco Switching/Routing :: Switch 3750G Stack

Jun 17, 2012

have one 3750G stack with 4 switches and this stack is presenting the follow log message:
 
%PLATFORM_UCAST-4-PREFIX:  One or more, more specific prefixes could not be programmed into TCAM and are being covered by a less specific prefix, and the packets may be software forwarded.
 
In this stack we are using the layer 3 with OSPF routing, and the current sdm prefer is default:
 
switch-01-3750#sh sdm prefer
The current template is "desktop default" template.
The selected template optimizes the resources in
the switch to support this level of features for
8 routed interfaces and 1024 VLANs.(code)

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Cisco Firewall :: VLANs ACLs In A 3750 Switch Stack

Jan 15, 2013

A CISCO 3750-X stack with several VLANs  and many ACLs applied to the virtual interfaces. Intervlan routing is on. Connected to this stack are VMware hosts and with about 500 VMs.We started using the ACLs to allow connectivity between VLANs to specific hosts and it has grown to thousands of lines. I personally do not think this is good for the switch and believe the switch was not intended to be used for that security feature.

- Does it make it sense to add an "internal firewall" between the CORE ROUTER AND THE 3750-X SWITCH STACK ?

- Do you recommend any other way?

- Any recommended CISCO resource/white paper to read about best practice

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Cisco Switches :: Possible To Stack 3Com 3cr17161-91 With Another Layer 3 Switch

Sep 25, 2012

I would like to ask if it is possibe to stack a 3Com 3cr17161-91 to a layer 3 Cisco Switch? The two will be stacked using the avaialble SFP modules.

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Cisco Switching/Routing :: WS C3750 Stack Switch Compatibility

Mar 13, 2011

We have existing stack of  3 units of  WS-C3750-48TS-S ( 100 mbps ports with Gigabot uplinks). with IOS as follows, Can we add  WS-C3750G-48PS-S  in this same stack (this is 48 Gigabit ports)?

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Cisco Switching/Routing :: Stack Behaviour Of 3750 Switch

Nov 17, 2012

I configured 3750 A  switch with vlan 20 and its IP address 192.168.20.41Its default gateway was 192.168.20.3Then i configured 3750 B  switch with same default gateway and vlan 20 IP   192.168.20.43My question is now when we stack it becomes single switch and now vlan 20 ip address is 192.168.20.43 thats only IP i can see.So how does stack switch choose vlan 20 IP?Does it choose highest IP address between two switches if they have same vlan 20 as in my case?Also when i go to switch 3750 b by session command and do sh ip route  it does not show ip default gateway .Also it shows vlan 20 as admin down .

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Cisco Switching/Routing :: 3750-X - How To Shutdown Only Switch In Stack

Aug 11, 2011

I have a doubt. In my environment I have two Switch 3750-X in stack.

My question is: How to shutdown remotely only a switch in stack?

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Cisco Switching/Routing :: 3750 - Removing Switch From Stack Of Three

Oct 30, 2011

We have a stack of 3 cisco swithes 3750s WS-C3750G-24TS 12.2(25)SEB4 .We plan to recover a switch from the stack as it is not needed any more The switch we plan to recover is the existing Master.If we change the priority (switch 1 priority) and make another switch the master using command line will we have any loss of connectivity to the servers conecting to the stack ?

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Cisco WAN :: Unable To Save Configuration Cat 3750 Switch Stack

Jul 4, 2012

I have a 3750 stack of 4 switches that was installed about 2 years ago. Recently I was doing some work on the switch and realized that I am unable to save the config. I amobviously concerned that if the power fails or the switch reboots I will be reconfiguring it and that is not something I am interested in doing!

Here is the error that I am receiving:
 
switch#copy run startup-config
Destination filename [startup-config]?
Building configuration.

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Cisco Switching/Routing :: 2960s Switch Stack IOS Upgrade?

Apr 18, 2012

I was just curious about something with upgrading a 2960s stack.
 
To copy the image to the switches in the stack I use: Switch# archive download-sw tftp://x.x.x.x/filename
 
Does this also set the image as the boot image or do I still need to issue the boot system flash command?
 
can I just issue this command on the master switch and reload and the new config will be pushed to the rest of the switches?

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Cisco Switching/Routing :: Stack 3750G-12S-S With 3750X-48T Switch?

Apr 14, 2012

if we can stack the 3750G switch with a 3750X switch ?

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Cisco Switching/Routing :: 3750 - Adding New Switch To Stack With Different IOS

Sep 12, 2012

We have a WS-C3750G-24PS switch running 12.2(50)SE , C3750-IPBASEK9-M in production & stand alone and we want to ask a new Cisco WS-C3750-24P running 12.2(55)SE3 , C3750-IPBASEK9-M into the stack with the 1st one.
 
Just want to know if it is possible and are there any problems with the IOS being different version.

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Cisco Switching/Routing :: CBS 3120X-S Switch Stack Member Down

Mar 4, 2012

I have a 3 member CBS3120X-S stack in a HP C7000 enclosure (switches 1, 3, and 5). Switch 1, (the previous stack master) is not showing up in the stack and all the ports are down. Switch 3 has taken over as master, but I don't know what happened to switch 1.  The system and stack lights are green and I am not seeing any messages in the log. I reset switch 1 and that did not resove the issue. I disconnected the stack cable and reset the switch again (pulled it out and pushed it back in) and connected to it with a console cable. I get nothing on the console, not even rommon mode. I was connected at the default baud rate that worked when I connected the conole of the other switches in the stack, so I don't think is a serial configuration issue. If this is CBS hardware problem, I don't understand why the system light is green.

Switches 1,3, 5 and provision configuration:
 
switch 1 provision ws-cbs3120g-s
switch 3 provision ws-cbs3120x-s
switch 5 provision ws-cbs3120g-s

[Code].....

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Cisco Switching/Routing :: 3750X - Single Switch Stack?

Mar 8, 2012

I have a 3750X 24 port switch (with NM-1G network module) running IOS 15.0(1). Is there any benefit or reason to plug in the included Stack Wise cable and loop it back to itself in a single switch installation?
 
I don't see any recommendation in the documentation. The data sheet indicates a single switch is a non-blocking device so I'd think there's no bandwidth advantage like there is when connecting an actual multi-switch stack and needing to close the loop for the full 32 Gbps stack bandwidth.

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Cisco WAN :: Periodic Process Cpu Peaks In 3750 Switch Stack

Jun 7, 2012

I have a problem with a 9 3750 switch stack. If you take a look at the show proc cpu history command , the following is seen:
 
1291999691191111911110111991117911119111191111911119111931
8994899595719876945570744993236132549385494445924169433963
100 * *** * * * ** * * * * *
90 * *** * * * * ** * * * * * *

[Code].....
 
Is it maybe a normal background proccess that runs in all the switches but , for some kind of reason, is not working properly?

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Cisco Switching/Routing :: 3750 Switch Stack-port Changes

Feb 7, 2011

I have a stack with a lot of stack-port changes, but on all the ports, how can I determine the faulty switch in the stack, cables are already verified. We did also a restart of the whole stack power off/on
 
running version
 
WS-C3750-48P       12.2(55)SE            C3750-IPBASEK9-M
 
This is the output after 6weeks
 
Switch#/  Stack   Neighbor   Cable    Link   Link   Sync      #         In  Port#     Port              Length    OK   Active   OK    Changes   Loopback          Status                                          To LinkOK          --------  ------  --------  --------  ----  ------  ----  ---------  --------  1/1     OK         4      1

[Code].....

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