Cisco 3750 Ghost Multicast Issues

We are having problems with Symantec Ghost 8.0 (Solution Suite 1.0) multicast sessions autonegotiating and transmitting at 10MB half duplex over stacked 10/100 Catalyst 3750s (WS-C3750-48PS-E). Both sides of the connection are set to autonegotiate. The clients will connect at 100MB full duplex and start the multicast session but then we will immediately see one port on the 3750 drop to 10MB half duplex and log thousands of collisions. If we kill the session and drop that system out of the mulicast and retransmit, then another port will automatically drop to 10MB half duplex as soon as the data starts to push. We use the same NIC chipset and NDIS drivers for Ghost throughout our entire operation but are only having this problem with two switches in the stack (7 total). If this were an overall incompatibility issue between the NDIS driver we're using (Broadcom 57xx), ghost, and the Cisco IOS then why do we not see this behavior on all of our switches? Our operation is too large (university) to hard code 100MB full duplex on both sides of the connection so we really need autonegotiation to work. We do not see any collisions on these switches when we are not using Ghost multicast. CPU and memory utilization on the 3750s are normal while the session is transmitting. We've tried the suggested fixes from Symantec (which really only included messing arround with TTL values on the ghost server end) and different versions of NIC drivers to no avail.

There are multiple clients receiving the mcast stream and each time a different client/port has the problem. All it takes is one port throttling down to slow the ghost multicast for the entire session (effectively a 15GB image which should take 40min to ghost at 100MB full duplex takes 4.5 hours to complete). IGMP snooping is working as far as I can tell. We're not seeing any multicast or broadcast packet floods during the ghost session and I'm seeing the IGMP, CGMP, and PIMv2 communications happening between the switches and routers via packet sniffs. We aren't doing any deliberate bandwidth throttling at all (QoS not enabled).
We've circumvented the Cisco switches in question with several different portable switches from other manufacturers and can image out fine at 100MB full duplex. As I stated in my original post, we can also ghost through other 3750s in the same stack with no problem. I also have two other floors in our building that use stacked Catalsyst 3750s and we have no issues with them as well.
We're not getting any packet loss or corruption. Just reduced throughput.

Similar Messages

Stack issue on Cisco 3750

Hi team,
I have an issue with the stack basing on Cisco 3750 switches.
Today on one of them, something went wrong and all ports are down.
Could you please advise, what happened? In what direction I should work to find root cause?
thank you

Hi,
I have found out what is the root cause.
In stack, I have 4 switches:
1. Member
2. Master
3. Member
4. Member
But right now I have next picture
1. Member - status "Ready"
2. Master - status "Ready"
3. Member - status "Provisioned"
4. Member - status "Ready"
5. Member - status "Ready"
I have checked MAC addresses, I have noticed, that member 3, became member 5.
For resolving this issue, I just need make member 5 member 3, but I don't know how to do it exactly.
My plan is:
- remove member 3.
- change number of the member 5 to member 3
Is it correct?
Thank you,
Igor

Unable to ping device behind Cisco 3750 on the same inside VLAN via Cisco ASA 5505 Anyconnect VPN

Hi Guys,
I've been stuck with this for the last 2 days, and I thought to try and use Cisco's forum, I setup my home DC, and started having problems once I moved a Cisco 5505 behind a Cisco 1841 router (I wanted to eventually test DMVPN live on the internet,) I was no longer able to ping some devices, then as soon as I introduce a collapsed core/distribution switch, I'm also no longer able to ping the devices behind the Cisco 3750, I've attached a network diagram and the ASA running-config.
Everything seem fine internally with the exception of an intermittent network connectivity with a Citrix NetScaler VPX running on a VMware ESXi.
For some odd reason, I am able to ping the following, with no issues.
Cisco 3750 SVI (192.168.1.3)
CentOS web server (connected directly to the Cisco ASA 5505)
I have checked and enable the following:
Nat Exemption
Sysopt connection permit-vpn
ACL's
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface
Added ICMP in the inspection policy
Packet-capture - Only getting echo requests.
Thanks in advance!

Hi,
I believe you have the problem with your no-nat configurations..... you to exempt NAT for the traffic from 172.16.10.0 (Anyconnect VPN pool) to 192.168.1.0/24 (Inside LAN) to make this work
object network acvpnpool
subnet <anyconnect VPN Subnet>
object network insidelan
subnet <inside lan subnet>
nat (inside,outside) source static acvpnpool acvpnpool destination static insidelan insidelan
Make sure that you are able to reach the GW/Inside ip adress of the firewall from LAN machine.... all routing in place properly..... Thanks!!!
Regards
Karthik

MAC address flapping on 2 x Cisco 3750 (Stacked)

Hi All,
I am having some issue with my connectivity.
The setup with HP virtual connect (VC) is as below:
Server A NIC 1 -- VC 1 -- Switch A
NIC 2 -- VC 2 -- Switch A
Server B NIC 1 -- VC 1 -- Switch A
NIC 2 -- VC 2 -- Switch A
The VLAN configuration are done on individual NIC card on the servers and the switchport on Switch A facing the VC connect are all on trunk mode.
Currently I am seeing MAC address flapping on my Switch. The switches are CISCO 3750 and are being stacked so it appears logically as 1 switch.
Any idea what might be the problem?
Below is an output of the flapping on the switch.
%SW_MATM-4-MACFLAP_NOTIF: Host xxxx.xxxx.0637 in vlan 1 is flapping between port Gi2/0/3 and port Gi2/0/5
%SW_MATM-4-MACFLAP_NOTIF: Host xxxx.xxxx.46eb in vlan 1 is flapping between port Gi1/0/5 and port Gi1/0/7
%SW_MATM-4-MACFLAP_NOTIF: Host xxxx.xxxx.661d in vlan 1 is flapping between port Gi2/0/15 and port Gi2/0/7

Hi,
Problem of MAC FLAP could resolve by following methods:.
Check with the server providers to see if the OS and server platform support 'NIC' Teaming (NIC Bonding).
FYI - NIC teaming allows users to group two or more physical NICs into a single logical network device called a bond. Once a logical NIC is configured, the virtual machine is not aware of the underlying physical NICs. Packets sent to the logical NIC are dispatched to one of the physical NICs in the bond and packets arriving at any of the physical NICs are automatically directed to the appropriate logical NIC. If one of the underlying physical NICs is broken or its cable has been unplugged, server will detect the fault condition and automatically move traffic to another NIC in the bond.
Hope that help
If helpful do rate
Ganesh.H

Cisco ASA 5505/Cisco 3750

I have a Cisco 5505(base license) and a Cisco 3750(48 port). I want to be able to connect to the 3750 on different vlans(for home lab),but I'm no able to ping the "outside" IP of the ASA. I can ping the different vlans from the ASA once I created the routes from the ASA.
3750 config:
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
hostname SwitchA
no aaa new-model
switch 1 provision ws-c3750-48p
ip subnet-zero
ip routing
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
vlan internal allocation policy ascending
interface FastEthernet1/0/1
description Uplink to Cisco ASA 5505
switchport access vlan 100
switchport mode access
spanning-tree portfast
interface FastEthernet1/0/2
no switchport
no ip address
interface FastEthernet1/0/3
interface FastEthernet1/0/4
interface FastEthernet1/0/5
switchport access vlan 10
interface FastEthernet1/0/6
interface Vlan1
no ip address
interface Vlan2
ip address 10.10.0.1 255.255.255.0
interface Vlan3
ip address 10.10.1.254 255.255.255.0
interface Vlan10
no ip address
interface Vlan100
description SW-to-ASA
ip address 172.16.100.2 255.255.255.0
interface Vlan172
no ip address
interface Vlan182
no ip address
interface Vlan192
no ip address
ip classless
ip route 0.0.0.0 0.0.0.0 172.16.100.1
ip http server
ip http secure-server
ASA Config:
interface Vlan1
shutdown
no nameif
no security-level
no ip address
interface Vlan10
nameif users
security-level 100
ip address 172.16.10.254 255.255.255.0
interface Vlan172
no nameif
security-level 100
ip address 172.16.100.1 255.255.255.0
interface Vlan192
nameif OUTSIDE
security-level 0
ip address 192.168.1.1 255.255.255.0
interface Ethernet0/0
switchport access vlan 192
interface Ethernet0/1
description Trunk to Switch
switchport access vlan 172
Is this even doable?

Hi,
I believe you have the problem with your no-nat configurations..... you to exempt NAT for the traffic from 172.16.10.0 (Anyconnect VPN pool) to 192.168.1.0/24 (Inside LAN) to make this work
object network acvpnpool
subnet <anyconnect VPN Subnet>
object network insidelan
subnet <inside lan subnet>
nat (inside,outside) source static acvpnpool acvpnpool destination static insidelan insidelan
Make sure that you are able to reach the GW/Inside ip adress of the firewall from LAN machine.... all routing in place properly..... Thanks!!!
Regards
Karthik

Etherchannel two cisco 3750 stacks for iscsi?

I have two sites connected by 96 strands of fibre. At each site I have an IBMv7000 relicating to the other one. For iSCSI traffic I have two Cisco 3750 switches, each are in 2 switch stack.
SAN A                         Fibre Link                          SAN B
        |                                                                        |
Cisco Stack A =========================Cisco Stack B
        |                                                                        |
        |                                                                        |
iSCSI Clients                                                       iSCSI Clients
My question: Is it ok to connect the the two stacks with etherchannel using the fibre links? Will is provide the necessary redundancy, if one of the interfaces goes down?

What model numbers of 3750 are you using?
What is the distance between the stacks as this will dictate your fiber run modules.

ISCSI traffic running across Cisco 3750 Switches

My customer has a small shop with 2 servers runnig iSCSI to a SAN device. They are looking for a switch recommendation and I would like to use a pair of Cisco 3750's, to take advantage of the VSS technology for redundancy,L3 and some other Core requirements, but I am concerned about performance.
I thought my other option is to use 3750E's but concerned about the added costs.

The fabric and pps ratings for the 3750Gs don't support wire-rate for more than 16 gig ports. (Max performance for 3750G models is 38.7 Mpps and 32 Gbps fabric; for 3750-E it's 101.2 Mpps and 128 Gbps fabric [NB: pps is enough, slightly insufficent fabric bandwidth for 48 port models - similar 4948 offers 102 Mpps, 136 Gbps].)
Another performance limitation of the 3750s (and to lessor extent the 3750-Es) is stack ring bandwidth. As best I can tell, the 32 Gbps is really dual 8 Gbps duplex (dual 16 Gbps duplex for -Es). An important distinction between the original StackWise technology and the later StackWise+, the former puts a copy of all traffic on the stack, the latter suppresses unnecessary unicast. The former also requires the sender to remove the traffic from the stack ring, the latter the destination removes the traffic. (I.e. the "+" technology, really is plus.)
For really, really demanding performance, a stack ring isn't the same as a chassis fabric (e.g. 4500s), and within a single switch, the lower end switch models, they can't always provide wire-rate for all their ports. However, the real question is whether you need this performance in a small shop even though iSCSI is being used.
In other words, its rare to see all ports demanding full bandwidth, so a stack of 48 port 3750Gs migtht work just fine for your customer if the actual need doesn't require more than the device can supply.
In similar situations, I present the customer with such facts. Based on what the expected load is, device "A" might work fine, but it can't guarantee performance beyond a certain level. If customer wants the capability for more performance, for growth or "just to be safe", can do too, here's your options (and extra cost) for that too.
BTW, if SAN devices can support 10gig, then you'll need something better than the 3750G since the model with a single 10gig port has been discontinued.

Has there been any helpful remedy for the ghost typing issue?

Has there been any helpful remedy for the ghost typing issue? Where the ipad starts typing on its own and screens moving around the screen?
I have had the ipad 1 for a while- and it started about 5 months ago. Anything other than shutting down and leaving alone for hours work?

Yeah, well if you read that whole thread you will see lots of posts identifying it as a hardware problem:
I'm the original poster on this thread. I ended up taking my iPad back to the Apple Store. They ran some diagnostics, and found that my RAM was almost maxed out, which didn't really make sense. It indicated a faulty processor, so they gave me a new iPad. I took it home, synched, and it only took about 45 minutes to synch 30 gigs of data. My original iPad took about 5 hours to synch for the first time. Clearly there was a problem with the processor in the first one, but I didn't realize it at first, as it took several weeks before it started exhibiting the erratic screen behavior. Hope this helps anyone else who might experience this down the line.
-merenvov
So i went to my apple store... which was PACKED. Found a manager and explained my problem. Without any question, they simply replaced it. Awesome!
-duncanwilcox
I have the same problem, and I found out what's wrong, it's not the software - restart, restore and FW upgrade will not help, it's definitely hardware. The best option is to replace your iPad assuming you have an apple store nearby…
-DarkDwarf
Just get your iPad replaced. It has a hardware problem.

How can I mirror all ports on CISCO 3750 switches to one Gigabyte port?

Hi,
I have a requirement to mirror all the ports on my 7 CISCO 3750 switches, which are in 3 separate stacks, to one single Gigabyte Ethernet port.
Does anyone know how I can do that?
Thanks in advance.

Vlad, thanks a heap for your response.
I want to apply to my sitation. Please let me know if I get them right in the following:
Catalyst A
vlan 901
remote-span
monitor session 1 source interface fastethernet 1-48 (I want to monitor all ports on the CISCO 3725)
monitor session 1 destination remote vlan 901
Catalyst B
vlan 901
remote-span (If I don't need to monitor this switch, do I still need to put anything into this switch at all?)
Catalyst C
vlan 901
remote-span
monitor session 1 source interface fastethernet 1-48 (I want to monitor all ports on this switch as well)
monitor session 1 source remote vlan 901
monitor session 1 destination interface gigabitethernet 3 (There are 4 Gigabit Ethernet Uplink in CISCO 3750, I want all the traffic to go to port 3, is this the right way to do?)
Thanks in advance.

Best way to connect 2 Cisco 3750 PoE 24-port Switches

Hello. I have 2 Cisco 3750 PoE 24-port switches in a small office environment. Right now I have a trunk configured off my ASA 5505 to switch 1, and then just an access port configured on a port (switch 1) and an access port configured on a port (switch 2) to connect them together. These switches also have 2 GB SFP ports but they are not being used in this configuration.
I was curious to know if anyone had any better recommend configurations for connecting these 2 switches together? I'm not sure if this particular model can be stacked?

What are the exact model numbers (should be written on a sticker)?
You will know if they can be stacked as you will see the 2x stack ports on the back of each switch :)
If they can then that is probably the way to go unless you want to keep them as separate switches for some reason.
If you want them separate, I would connect them via a Trunk link at least so you can have the same Vlans on both.
Thanks

Compatibility Cisco 3750 and GBIC 1000Base-ZX/SFP

Hello,
I have some problems to use a GBIC 1000Base-ZX on a cisco 3750.
With some research , i have find these thing :
The Catalyst 3750 models support these Cisco SFP options:
1000BASE-LX
1000BASE-SX
1000BASE-T
1000Base-ZX didn't appear.
What do you think of such thing.
Thanks for help

The 1000BASE-ZX SFP (Cisco product number GLC-ZX-SM=) is supported on the Catalyst 3750:
Cisco Optical SFP Transceiver Compatibility Matrix
http://www.cisco.com/en/US/products/hw/modules/ps5000/products_device_support_table09186a0080212cba.html
List price in the US is the same as for the 1000BASE-ZX GBIC (Cisco product number WS-G5487=)
It's possible that the information you have found has not been updated yet. I believe the ZX SFPs were among the last ones to become available. The Release Notes in the link below are the first ones to mention this SFP, they refer to it as "new hardware" (versus the SX and LX SFPs):
Release Notes for the Catalyst 3750 Switch Cisco IOS Release 12.1(14)EA1 July 2003
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12114ea1/ol421501.htm
Hope this helps.

SFP change on Cisco 3750-X 24S

Hello,
I have a Cisco 3750-X 24S equipped with GLC-GE-100FX optical module to provide 100Mbps connectivity to workstation. I have to migrate the workstation NIC to 1 Gbps and, after that, I have to replace the 100base-FX SFP with the 1 GB SFP.
Wich initial configuration on switch port allowm me to replace the SFP without any reconfiguration on the switch port?
Thanks
Gabriele

Paolo is correct in that you do not need to change the configuration for the switch to recognize the SFP.
However some IOS versions and hardware platforms do require you to manually configure the interface speed (even though a fiber SFP only operations at a fixed speed). Check the current port configuration. If it has "speed 100", be sure to change it to "speed 1000".
Hope this helps.

Challenge: Spanning Tree Control Between 2 links from Switch DELL M6220 to 2 links towards 2 switches CISCO 3750 connected with an stack (behavior like one switch for redundancy)

Hello,
I have an Spanning tree problem when i conect 2 links from Switch DELL M6220 (there are blades to virtual machines too) to 2 links towards 2 switches CISCO 3750 connected with an stack (behavior like one switch for redundancy, with one IP of management)
In dell virtual machine is Spanning tree rapid stp, and in 3750 is Spanning tree mode pvst, cisco says that this is not important, only is longer time to create the tree.
I dont know but do you like this solutions i want to try on sunday?:
Could Spanning tree needs to work to send one native vlan to negociate the bdpus? switchport trunk native vlan 250
Is it better to put spanning-tree guard root in both 3750 in the ports to mitigate DELL to be root in Spanning Tree?
Is it better to put spanning- tree port-priority in the ports of Swicht Dell?
¿could you help me to control the root? ¿Do you think its better another solution? thanks!
CONFIG WITH PROBLEM
======================
3750: (the 2 ports are of 2 switches 3750s conected with a stack cable, in a show run you can see this)
interface GigabitEthernet2/0/28
description VIRTUAL SNMP2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 4,13,88,250
switchport mode trunk
switchport nonegotiate
logging event trunk-status
shutdown
interface GigabitEthernet1/0/43
description VIRTUAL SNMP1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 4,13,88,250
switchport mode trunk
switchport nonegotiate
shutdown
DELL M6220: (its only one swith)
interface Gi3/0/19
switchport mode trunk
switchport trunk allowed vlan 4,13,88,250
exit
interface Gi4/0/19
switchport mode trunk
switchport trunk allowed vlan 4,13,88,250
exit

F.Y.I for catylyst heroes - here is the equivalent config for SG-300 - Vlan1 is required on the allowed list on the catylyst side (3xxx/4xxx/6xxx)
In this example:
VLANS - Voice on 188, data on 57, management on 56.
conf t
hostname XXX-VOICE-SWXX
no passwords complexity enable
username xxxx priv 15 password XXXXX
enable password xxxxxx
ip ssh server
ip telnet server
crypto key generate rsa
macro auto disabled
voice vlan state auto-enabled !(otherwise one switch controls your voice vlan….)
vlan 56,57,188
voice vlan id 188
int vlan 56
ip address 10.230.56.12 255.255.255.0
int vlan1
no ip add dhcp
ip default-gateway 10.230.56.1
interface range GE1 - 2
switchport mode trunk
channel-group 1 mode auto
int range fa1 - 24
switchport mode trunk
switchport trunk allowed vlan add 188
switchport trunk native vlan 57
qos advanced
qos advanced ports-trusted
exit
int Po1
switchport trunk allowed vlan add 56,57,188
switchport trunk native vlan 1
do sh interfaces switchport po1
!CATYLYST SIDE
!Must Explicitly allow VLan1, this is not normal for catalysts - or spanning tree will not work ! Even though it’s the native vlan on both sides.
interface Port-channel1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,56,57,189
switchport mode trunk

HP 6600 connected to Cisco 3750

Hello,
I have a new hp 6600-24XG 10gb switch. I would like to connect it to an existing cisco 3750 core switch so the hp will see the network. Is it possiblle to connent one of the 10 gig ports to the 3750's one gig port and set the speed to one gig?
Would I have to buy a module for one or the other of will this just now work?
I appreciate any feedback.
Thank you

miczellcisco wrote:Hello,I have a new hp 6600-24XG 10gb switch. I would like to connect it to an existing cisco 3750 core switch so the hp will see the network. Is it possiblle to connent one of the 10 gig ports to the 3750's one gig port and set the speed to one gig? Would I have to buy a module for one or the other of will this just now work?I appreciate any feedback.Thank you
According to HP's product page, the ports in that switch are 10 GbE only - so no you can't connect to it at one gig.
You could buy a 10 gig module for your 3750 switch - a C3KX-NM-10G (SFP), C3KX-NM-10GT (Copper) or C3KX-SM-10G (SFP with advanced features like Netflow), install it and use that to link to your HP switch.
Cheers

Throughput of Cisco 3750-E

Hi,
Can anyone let me know the actual throughput of Cisco 3750-E (WS-C3750E-24TD-S) Standalone switch and the throughput when stacked with 4 nos of WS-C3750E-24TD-S ?
Is WS-C3750E-24TD-S ports oversubscribed?
Sam.

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Posting
I think the 68 Gbps backplane supports the 48g port variants plus two 10g ports; i.e. 48+10+10=68.
What's a bit confusing, fabric specifications are normally "doubled" to allow for duplex ports but Cisco, in the posted spec uses the term "backplane" rather than "fabric".
Also confusing, when stacked, there's a pair of 16g stack ports too. It's unclear whether the same backplane or fabric bandwidth is shared with those, or whether there's additional capacity to support them too. I.e. the 3750-E might support wire rate bandwidth when used standalone but might not when stacked.
In any case, when 3750-E units are stacked, the stack ring can be a potential bottleneck. Fortunately, besides StackWisePlus offering twice the stackport bandwidth of StackWise, it also supports (for unicast) destination stripping and also (for unicast) only puts traffic on the stack ring when it must. Still, again, it's a potential bottleneck. It's also a ring, not a fabric.
PS:
Besides bandwidth, you need to check a switch's PPS capacity. I believe the 3750-E has sufficient PPS it can generally support wire rate.
However, one common problem with 2960/3560/3750 series switches is lack of RAM for deep buffering. The 3750 series, I understand, to have 2 MB per 24 copper ports and 2 MB for the uplink ports.
The 3750 stacks are often fine for user edge ports, often not so fine for more demanding roles.
PPS:
Also believe the 3750-E is end-of-life and end-of-sale.

Cisco 3750 Ghost Multicast Issues

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