Cisco Switching/Routing :: Timeout For Mac Address Table In 3750E
Dec 6, 2011
I have 3750E swiches with IOS v. 12.2(55)SE3. Couple servers connect to ths switch, after ping of IP this servers I can see mac addresses in mac address table.
For instance:
sw1#show mac address-table vlan 20
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports(code)
---- ----------- -------- -----
When ip generate traffic to this server this mac address appear in table again on shot time (less than 10 seconds).
we have 6500 cisco switch as a backbone switch in universty. When ı want to look mac addres table , it does no show all mac address.ı mean if ı type ;show mac address-table there are not all mac address.
As u see above , the inetrface Gi0/6 , Gi0/7 are connected directly to linux server by two redundent links .
I mean that Gi0/6 is connected to interface0 in linux server and Gi0/7 is connect to interface interface1 in linux server
Gi0/6===>vlan 1 Gi0/7===>vlan 2
each interface of linux server has a different ip and different gateway .
Now from switch, I make ping to interface 0 of linux server and i have a reply , every thing is ok but when i type the command : #sh mac address-table | i Gi0/6
There is no Mac addresses and seems no Mac address relative to Gi0/6, I mean that doesn't it mandatorty to learn the mac address of linux server and write in mac table relative beside interface Gi0/6 ? How I could ping the server but no mac beside Gi0/6 ?
we have cisco WS-C6509-V-E with IOS version 12.2(33)SXI4; s3223_rp_IPSERVICESK9_WAN_M) running on a switch. I am trying to configure the command "mac-address-table synchronize" under global config mode. But when I enter the command Cisco(config)#mac-address-table ?It doesn't show the synchronize option?
We want to configure the "mac-address-table synchronize" command on our 6500 series switches to ensure that the CAM tables on our DFCs are in synch with the PFC on the supervisor modules. url...it is recommended that we disable the routed MAC purging with the mac-address-table aging-time 0 routed-mac global configuration command. What is a routed mac entry? Are there any issues with running that mac aging-time command?
We also plan to run this command "mac-address-table aging-time 14400" to keep our ARP and CAM tables on the same aging time to reduce unicast flooding on our network. Can we run this command with the "routed-mac" command above?
I need to use cisco 3750E switch on core. I want to know whether BGP is supported on this model or not?Currently i have c3750e-universalk9-mz.150-2.SE/c3750e-universalk9-mz.150-2.SE.bin" preinstalled. and i checked BGP is not supported on this IOS image.
Quick question here. Using 3750E series switches with multiple VLANS configured. These switches serve as our 'core'. I have SVIs configured for the different VLANs and add inbound ACLs in each of the SVIs to control traffic between VLANS. This switch also terminates a P2P Ethernet link which connects to our Colo facility. The port used for this is configured as an L3 port. I noticed today that I was able to send traffic across this L3 link that I thought should have been blocked by an ACL I had in place but it wasn't. So the traffic flowed from a port in say VLAN 20 across this L3 link (assigned with an IP address). Would this traffic flow not cause traffic to be checked against an ACL applied in the inbound direction on the SVI of VLAN 20 (int vlan 20)? Traffic does get checked when routing between SVIs. Why would it not get checked when routing between SVI and L3 interface?
I am in the process of upgrading our network switches and wondering if the .lic file will work with the new software or if I have to rehost for the move to 15.0. Its a remote site and I would like to get some solid info before I pull the trigger.
Also which IOS should I be upgrading to?
c3750e-ipbasek9-mz.150-2.SE.bin or c3750e-universalk9-mz.150-2.SE.bin
have 2 3750's one is an 3750E the other one is a G... Since they are 2 different versions Do I need to correct ios for each for example my 3750E switch i would have
IP BASE c3750e-ipbasek9-mz.122-53.SE2.bin and for my 3750G switch should i use
We're seeing "OutDiscard" error on a LAN switch connected to newly migrated Cisco IP phones. All the other error counters are clean except for the OutDiscard. (please see attached "show int count err" output.) [URL].
According to the link above, the common cause of such discards can be to free up buffer space.(Am I seeing a switch buffer issue?) How to identify/resolve the cause of the OutDiscard.The switch is 3750-E running c3750e-universalk9-mz.122-44.SE6.bin
I am seeing on my 3750E series switches (WS-C3750E-48TD). I have multiple VLANs configured on here, one which is used as a 'workstation' VLAN. I have an inbound ACL applied to the VLAN interface *(int vlan 50 to be exact). This list is admittedly long at roughly 6000 ACE's. Now I just recently installed these switches as they replaced some 4507R switches which we moved to our new centralized DC. Here is the issue I am having. This same ACL was applied to the same VLAN interface on the 4507s when they were doing the work of the 3750s. What I used to be able to do was actually edit the ACL by removing it with no ip access-list extended WS-In and then followed up by the ip access-list extended WS-In ......and the lines I wanted in the ACL. I know I could use the line numbers to edit the ACL but this worked OK for me. When I would do this on the 4507R, the ACL was still applied to the interface but traffic never seemed affected by the removal and re-adding of the ACL. I did this by copying and pasting the ACL into a terminal window. It seemed as though on the 4507 the ACL was not compiled until the entire thing was in loaded in and therefore traffic was not processed by the ACL until the load was done
I have a 3750E stackable swtch and I need to configure neflow on it. Are there any IOS versions that support netflow on the 3750E? Is there any possible to configure netflow on a 3750E? I do not see any netflow commands available on the switch?
I had a lot of problems with TCAM table in the past and made changes in SDM ended whit that. But now want to be proactive and anticipate the problems in my TCAM table.
If the my template is "default desktop" they support a number of indirect IPv4 routes of 2k. I wanna know automatically by my management tools if this number reaches 1.9k.
That way I can take corrective actions before the problems starts on my network.
I have a RVS4000 connected to my cable modem which I use as my gateway, the IP address of the RVS is 192.168.3.254
I have a 2811 with 3 subinterfaces of which I can ping all of them from my PC which at the minute is in VLAN 1, the only network that can connect to the outside world is VLAN 1, how can I enable the other 2 vlans to connect to the internet?
My set-up details are
Router
interface FastEthernet0/0.1 description *** Data Network*** encapsulation dot1Q 1 native
After I added the 3rd 3750E to my stack on Sunday I can no longer save my configs with 'copy run start' or 'write mem':
#copy running-config startup-config Destination filename [startup-config]? Building configuration... nv_done: unable to open "flash:/config.text.new" nv_done: unable to open "flash:/private-config.text.new" nv_done: unable to open "flash:/multiple-fs.new"[OK]
We tested a QoS in a Cisco 3750E, IOS: 12.2(58)SE2.Voice traffice in the correct Q without any problem, but all the others traffic the Defualt Q (0), tried to capture the traffic and tcp/udp port are correct.Any thing wrong with my ACL or DSCP - CoS?? ( that ACL works fin on 4500 and 6500) [code]
I am not able to find the exact bug for Cisco 3750E stack - Debug Exception (Could be NULL pointer dereference) Exception (0x2000) error. Closest i can find is CSCsa72400 which only affects ver 12.2(20)SE4.All the stacks (3 switches) are running 12.2(50)SE3, It appears that the switch 1 crashed and reloaded. My hunch is its software but i cant find any related bugs. It could be hardware issue as well ?
I have a device which will be sending voice and data packets and is able to mark the packets with DSCP values. Voice, 18 and Data 42.If this was a straight through network, I'd be clear on how to handle this, but.....I will be putting this traffic into a VLAN to isolate it from some other traffic on the network. What is the best way to prioritize this traffic inside the VLAN? Will the Cisco switch look at and respect the DSCP values inside the VLAN and prioritize accordingly inside the VLAN? Or, do I need to do some sort of DSCP to 802.1p mapping? Another option I would be fine with would be mapping the DSCP values for voice and data to two different VLANs and then giving the voice VLAN priority over the data VLAN .... I'm using 3750E switches.
What is meaning backup on HSRP statas?There are 5 vlans.The other four vlans aren't backup status.Only one of five vlans display messeages. When I reload Catalyst3750E-1,debug log. [code]
9x3750E stacked switch (WS-C3750E-48PD-SF0) (15.0(1)SE2 C3750E-UNIVERSALK9-M) 2x10Gbe uplinks from EMC NAS
At a basic level, we have found that the 10Gbe uplinks have slow read performance with or without a port-channel configured (2-3 minutes for a 700MB file to desktop from the NAS) We switched back to testing a 1Gbe and the read speed is normal. Another anomaly is Win7 / 2008 machines read speed is fine from the NAS while the 10Gbe uplinks are in production?!
Write speed is great on 10Gbe. Only read speed is affected!! the switch is not reporting anything abnormal. We looked at SMB/SMB2 as another possible cause...
mls qos is enabled on the switch but not sure if this is affecting performance.
Is the ANY config that I need to carry out on the interfaces to get the read speed working as it should for both Win7 and WinXP. (MTU is 1500 throughout the enterprise, NAS included).
I have installed and configured 2 new WS-3750E-24TD in the last 30 days, that have software version 12.5(50)SE2-universalk9, on our flat Development LAN (currently 7 existing WS-3750E-24TD with 12.5(35)SE2-universal)The new switches have shutdown, 1 has shutdown twice and I just had the other one shutdown on the weekend, all the status lights on the left are lit up but no port lights are on, I am not able to console in to the switch all I can do is cycle power. I am planning on upgrading all switches to the latest software release universalk9-mz.150-1SE
could this problem be a version incompatibillity between the switches?
We have many 3750E's and need to use Finisar X2 modules FTLX8541E2. After 15.0(1) IOS upgrade the 3750's now recognize the Cisco part X2-10GB-LRM's, but will not recognize our Finisar modules.
According to the following Cisco webpage, cross-stack 10-Gigabit EtherChannel is possible on the 3750 with up to two 10-Gigabit modules, using LACP: url...However, the webpage doesn't confirm if this functionality is restricted to a particular 3750 model, such as 3750E, or if it applies to all models. It also doesn't specify any particular IOS feature set. I've tried Cisco Software Advisor but it doesn't list this feature on either the 3750E or 3750-X. This is possible on the 2960-S switches (i.e. cross-stack 10gig EtherChannel)?
I need to connect one sw3750E with two 3750X , with Uplinks at 10 GBps. My doubt is the next:
Switch 3750E has two TwinGig Adapter Converting 10 Gigabit Ethernet X2, phisically each twinGig adapter has 2 slots for SFP modules. Can I install sfp+ If I want to use copper for Uplink at 10 Gbps, I just need to install one SFP-H10GB-CU5M transceiver ???? the other SFP slot is disabled automatically?
in the other side 3750X in order to support copper at 10 Gbps a C3KX-NM-10G network module is considered, this will be connected to SW3750E by means of SFP-H10GB-CU5M.
The second 3750X will be connected to second twinGig Adapter of 3750E using another SFP-H10GB-CU5M transceiver.
We have 20+ VLANs on our main network, we have an offsite connected by metro GIG fiber ethernet. Right now, we have a layer 2 connection to there with the core at the main site as the gateway. We have had problems occationaly with the metro ethernet's spanning tree which then we would see our own network and cause an outage, not only for the offsite, but since the VLAN would see itself (not on our equipment but the metro ethernet carrier's) it would effect the main network as well.
What I was going to do to resolve this was change the connection to a routed network, however I need to still send some VLANs over the routed network (there are some applications that require to be on the same subnet as the server). Is there a way to Map the Vlan 10, and 11 at the main site to a vlan 10, and 11 at the remote site using a routed network? I noticed there is something about bridging, would I bridge the VLAN accross the routed MAN connection? Then would I bridge back the other way as well?
