Switch With 2 Uplink Port Incorrectly Used
Jul 6, 2012
Im now in charge of a medium/big size network (around 1200 machines).I found some connection pattern that im not shoure if it is correct.I migth be wrong, but i think this kind of connection would cause a continue RSTP change of topology (confusing about the 'direction' of the route to take), so having some latency period (this pattern of connection can be repeated several times in the whole network).BTW, there is no special configuration in switch A for saiyng that port 50 is not being used as a uplink port.
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Jun 17, 2012
I implemented the 3560E switch, this one have two Giga bit ethernet/10-Gigabit Ethernet module slots. I used the Twin Gig Converter Modules and one SFP. All configuration was applied in the Ten Giga bit, however the interface giga bit ethernet is UP UP state and the Ten giga down down.
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Apr 23, 2012
I need 10gigbit uplink for this switch. What are the other devices that i need order along with this device.And what is the diff between X2-10GB-LR= and CVR-X2-SFP.if i take CVR-X2-SFP, in future how can i upgrade from one gig to 10 gig?for current use i need 10gig support required. so what are all the other devices that i need to order.Fiber multimode and distance 15Mt only.
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Mar 19, 2013
I have a question regarding uplink ports on a switch. Specifically the SFP+ variety. Could these uplink ports be used to connect directly to a fileserver? To be more specific, would the uplink port on the HP 3800 Switches connect directly to a file server that has the SFP+ card installed?
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Mar 8, 2012
I am looking for a Switch with a 10GBE uplink to go with a qnap TS879u with a 10 GBE card.
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Feb 26, 2013
At our office we have a weird performance problem with the following switches and connectivity:
Internet |
SG300-24 (L3) core switch (in our server room)
|SG300-10P (L2) access swtich (in our meeting room) |
SG500-28P (L3) switch (in our meeting room)
We are building a new computer infrastructure that is connected to the the SG500-28P. As you can see above the SG500-28P in our meeting room has an uplink to the SG300-10P in the same meeting room. And again the SG300-10P has and uplink to the SG300-24 in our server room. From the server room, there is connectivity to internet. The network uses a multiple VLAN's and routeing between them. Bootom line is, the internet VLAN ID 10 is tagged to trunk ports and available on the SG500-28P. So client get connected straight into the internet based VLAN.
The performance on the SG500-28P switch itself from VLAN to VLAN is very fast. But... the uplink connection tot the internet and other VLAN's on the core switch are very and very slow! At least 10 times slower than normal. So if I plug a laptop in the SG500-28P and go from uplink to uplink, it is slow! But... when I connect the same laptop to the SG300-10P the connection with only one uplink it is fast. As if three switches is to much. I can't figure out why.
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Jan 24, 2013
I have configured about 20 of these switches now, and notice in the port listings a TE1/1//1 TE1/1/2 and GI1/1/1 GI1/1/2 uplink port. There are only two uplink SFP+ ports. I now have a reason to install with a 1Gb uplink to the Core. I am using a GLC-LH module at each end. I did configure the TE1/1/1 port for the uplink. Does not work though..Do I need to configure the two GI1/1/1 and 1/1/2 ports for uplink, remove the TE configuration for the uplink to work? Using the UNIVERSAL code with a LANBase license.
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Jul 5, 2012
I was trying to uplink a switch today on a 1500m run of SMF. I have a 6509 core switch with a 16 port GBIC module. On that end I have a WS-G5486-LX with a 3m SC to LC patch cable.On the other end I have a 3750G with a GLC-LH-SM SFP. I have checked my fiber path and it seems good, (by sight, did not have an OTDR avialable).I can't get the link up at all. Tried swapping Tx Rx at one end, Tried different transceivers. Tried different patch cables. Nothing worked. At about the mid-point of my fiber run the cable passes through another network closet with a core switch for a separate network. If I break my fiber path there and try to connect in either direction it works. The only differences are the length of the fiber run and that the core switch on the other network has a CLC-LX-SM SFP.Is it the distance? Or is there some issue connecting a GLC-LH-SM to a WS-G5486-LX?
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Aug 22, 2011
I've just purchased 2 switches SG100-24 and use fiber cable to connect these switch together. I plugged cable in module MGBSX1 and then put it into miniGBIC uplink port but despite trying many times, also rebooted devices, I still not make these uplink ports up. how can I bring them up?
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Dec 3, 2011
I need a L2 switch with dual AC power supply and RJ45 uplink The optin I got was WS-C3560X-48T-L + C3KX-PWR-350WAC , but the problem is with uplink . There is no RJ45 1G uplink , there is only option for SFP uplink The another option was WS-C2960G-48TC-L , but there is no dual AC power supply option a good model ( Dual AC power supply , RJ 45 uplink ports (Gig) , with 48 port 100/1000 UTP)
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Feb 5, 2012
I have a new Cisco 2960 S series switch with a basic configuration that needs to be uplinked or daisy chained to a Cisco 3750 switch. I am not getting any connectivity to the network with either a straight through or crossover cable. the port remains in amber but a 'show interface' indicates that the interface is up. I can manage the switch with a PC patched into any port on the switch with a static IP address. Must be something very simple that I am missing. Outlined below is the configuration.
Refresh_SW1#sh ver
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(55)SE3,
RELEASE SOFTWARE (fc1)
Technical Support: [URL]
[Code].....
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Oct 25, 2011
I'm connected to my router via an Ethernet cable, and on the connection icon I have the yellow triangle and a message indicating I have no internet access...but I do. My internet is fully connected and I have no problems remote connecting to my computer from work, downloading and seeding torrents or browsing websites. Problems is, it seems that Windows THINKING it's not connected is affecting other programs which need to connect to the internet.
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Jul 7, 2009
What is the impact of incorrectly setting the antenna gain on a the b/g radio of an AP would have on a WLAN?
I've come across a site where around a 3rd of the AP's had their antenna gain set to 0. I can only assume that something missed setting this during setup. The site uses 1242ABG AP's and each has 2 4941 antennas and i believe the gain should be set to 4 x 0.5dBi
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Feb 17, 2011
I ran into this recently with a client of mine. When uploading files (either via FTP or through a shared drive in terminal services) from the site any files larger than 200MB or so would hang in the middle of the upload as the TCP session timed out because the traffic was cut off. I started pulling apart the config on the 2911 edge router to determine what the issue was.
I trace the issue down to this particular policy which was created by CCP: sdmappfwp2p_CCP_LOW (When this policy was removed from the wan interface the issue vanished). The default config of this policy was as follows:
policy-map sdmappfwp2p_CCP_LOW
class sdm_p2p_edonkey
drop
class sdm_p2p_gnutella
drop
class sdm_p2p_kazaa
drop
class sdm_p2p_bittorrent
drop
I first removed the highlighted drop command from the edonkey class and reapplied the inspection policy to the WAN port and the issue remained resolved!
While this fixed the issue and I was able to block eDonkey traffic with just a simple outgoing ACL to block tcp port 4662 I find it very strange that a eDonkey inspection policy would cause such problems for eDonkey traffic. I know for sure this is the only change made on the router and I'm just scratching my head at what I've found. Is it a bug with NBAR? Mostly I'm just curious as the issue is already resolved.
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Jul 4, 2011
I notice that my Cisco switches have 2 fiber GBIC ports on them each and while i have been around networking for quite some time i have never dug that much into fiber. So after some quick googlefu i learned that there is lots of different types and compatibility problems.
The 2 switches i would like to connect are a WS-C3550-12T and a WS-C3550-48-EM.From what i have read these are 1000-base-fx?
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Jan 16, 2011
is it possible to assign a loopback address to a typical switch port on a 2950 switch? I want to be able to have some devices connected to a switch to test access lists and VLANs.
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May 8, 2012
On the supervisor card of a cisco 6500 series, according to the following link, [URL] it only has 2 uplink ports on the card. Would I be correct in assuming that I only have those to ports that I can configure IP addresses on?
The cisco that is being devlivere is coming with a 48 port switch and 24 port fibre switch. Could I change any of those ports into a router port and configure IP addresses on those?
The supervisor card is a ws-sup-720-3b the 48 port switch is a ws-x6748-ge-tx the 24 port fibre switch is ws-x6724-sfp
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Jun 5, 2013
I'm fairly new to Cisco products am in the process of developing my network knowledge on a deeper level. I have a 3825 with a HWIC-4ESW and I'm struggling to fully understand how the two "see" each other. I've setup a V LAN with a layer 3 address on the HWIC and added the switch ports to it. This seemed to allow devices connected to the switch ports to talk to the built-in router ports. I thought this was all making sense until i applied an access-list to the router port. It's a simple ACL i'm just using for testing and the only thing it does is blocks telnet from anywhere. I know the ACL is setup properly because if I connect a device directly to the router port i cannot telnet to the port. However, if i connect a device to one of the switch ports, i am able to telnet to the router port successfully.
It seems that I'm missing something with how traffic flows from the switch port to the router ports and how the two "see" each other.
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Dec 28, 2008
what is the use of no switch port command in L3 switch?
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Feb 26, 2012
I was looking for a way to connect an AUX port from a 1700 router to a 6500 switch module console port, to see the output of the Switch's on the 1700 router, in case there is a network downtime, I could see what's going on in the switch, what cable should I use ? Also, is there is any kind of documentation for this type of config what have I seen is very few info.
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Mar 6, 2013
I've got a Cisco 877-M at home which i picked up to replace the old Linksys/Cisco WAG160N, which was having dropout issues on my line?I've got a running config going on the router which is currently quite happily handling our LAN requirements (DHCP,IGMP Proxy, Firewall,DNS), but what I want to do is have an upload link QoS policy, which makes sure everyone can be able to access the net with little hassle (Not so much worried about the Downlink QoS, our connection can burst at time to 900k/sec (Currently on a 8160/384 ADSL1 Line, RIM, 300m Cable Length verified by ISP)I'd have to get the running-config from the router when I get home, but for a Home based network, what would be required in setting up a policy for Upload, to allow the following Protocols prioritised access to the net:
HTTP (Top Priority)
IMAP (Top Priority)
POP3 (Top Priority)
Streaming Audio (Med Priority)
BT (Low Priority)
These are the main ones.
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Dec 31, 2012
So the 2T comes with 2 10GE and 3 GE uplink ports. Can you use all 5, one or the other, a mix, or what? How does that work? It's not really clear from reviewing the products webpage or data sheet.
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Jun 26, 2011
My DIR655 is A4 with firmware v.135.
My normal uplink speed is above 4 Mbps but the speed goes down to 0.4 to 0.8 Mbps. The above unit was received from D-Link as a replacement for the same reason, but it worked for at lease 12 hours.
If the power is OFF/ON cycled, the normal speed comes back but last only about 10 minutes.
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Feb 7, 2013
I have an SA 500 with the optional port configured as the DMZ. The LAN ports are running the 192 range and the DMZ is the 172 range.
I have seperate offices (A few hundred feet apart) that have been connected with 2 un managed switches up linked with a single wire. The 192 range stuff runs over this. I need to get the DMZ out to the second room and was asking about how to do this over the single up link and switches. (Trying not to run a second wire)
My lack of understanding had me draw up this diagram attached as a picture, to ask about. What it shows is me trying to get the DMZ through the up linked switches to the other room. I thought of using 2 routers, one on each end. I've been told this is incorrect and wont work.
Maybe a purchase of a second hardware and eliminate the switches? (up link the SA 500 to another device?) What should that device be?
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Nov 15, 2012
We have a single HP 2810 switch being used for an iSCSI SAN.We want to replace it with dual higher end switches.But we've got another SAN to also setup now - Dell Equallogic PS6010E - that has 10gb iSCSI SFP+ ports.Can the 4 x SFP+ uplink ports on the Dell PowerConnect PCT5548 or the HP 3800-48G-4SFP+ switch be used for just the 10gb iSCSI, while the other 48 handle the 1gb iSCSI?We were told the uplink ports don't have buffering, making them bad ports for iSCSI traffic and only useful as uplinks to another switch.We only need 8 x 10gb ports (4 for 2 servers, and 4 for the Equallogic SAN), so if the above would work, it would probably save us $10,000 from having to buy a separate 24 port dedicated 10gb switch to handle it.
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Dec 7, 2010
We need rededunt uplink in Cisco 2960 from Cisco 3550 , one uplink is primary and one is for backup.As per current scenerio one uplink in Cisco 2960 interface fe0/1 from Cisco 3550 int fe0/1 through OFC cable configuration 2960 int fe0/1 interface fe0/1desciption *** Connect to Cisco 3550 port 1 ***switchport mode accessswitchport access vlan 2spanning-tree guard loop Configuration Cisco 3550 int fe0/1desciption *** Connect to Cisco 2960 port 1 ***switchport mode accessswitchport access vlan 2spanning-tree guard loop We have facing the problem when OFC cable down , so now we are considering anather OFC via anather route to connect same Cisco 2960 Switch in Fe0/2 from Cisco 3550 int fe0/2 so when primary uplink goes down then backup uplink which is connect to Cisco 2960 fe0/2 from Cisco 3550 fe0/2 it's up.what is the command we need configure as per my require in both the Cisco 2960 and 3550 swith in interface and global mode also.
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Mar 10, 2013
I have a router with 2 service providers connectivity with different ASN and running with BGP.I've announce few IP-prefix by ISP-A and Few Prefix by ISP-B.Both are working well with redundancy.But,Problem is here, that the all uplink bandwidth goes through ISP-A link.I want to make it that, ISP-A routed ip-Prefix's upload data will go through ISP-A & ISP-B IP-Prefix's Upload data will go through ISP-B Link.
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Nov 18, 2011
I have an older Wireless Access Point router (BEFW11S4) which I retired when I purchased a Wireless-G Broadband Router (WRT54G). I have added a 5th PC to my home computer network that does not have wireless capability. So now I have exceeded the 4-port limit of the WRT54G. Can I UPLINK from a Wireless Access Point router (BEFW11S4) to a Wireless-G Broadband Router (WRT54G)? I browsed the BEFW11S4 User Guide and could not find specific setup instruction for connecting another switch.
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Dec 9, 2012
Why the nexus 2k has 8 uplink ports ?
the nexus 7k or 5k can be devided into 4 virtual devices ( using vdc)and making 8 uplink ports in the 2k will allow us to use the extender for all the 4 vdc's with 2 uplinks ( for redundancy ) from each vdc
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Jan 28, 2013
I have a two Cisco 4510R each with two sup V-10GE redundant. The code on these sup modules are 12.2(31r)SG3. I need some assistance in getting this setup worked out. I have all four of the 10GE populated with appropriate optics. I setup a link from one 4510R to the other using these interfaces. From the documentation I found I had to use Tengi1/1 and Tengi2/2 as the redundant pair. I plugged the up link into these ports. The Tengi1/1 (active supervisor) links up and works fine. But when I look at the ports port Tengi2/2 it isn't showing link or active. Now port 2/1 (nothing plugged into it) is showing as active.
Now is the redundancy supposed to be 1/1 and 2/1? If so, the switch is in production, when I move the connection over from 2/2 to 2/1 will it cause a outage? The reason for this is I now have a system with a 10G port and would like to utilize one of the other 10G ports. Is that possible? Or does it have to be a lag/redundant up link to work (say to another switch)?
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Apr 25, 2013
i was checking the datasheet of 500X series and got confused regarding the 10GE uplinks. how many 10GE ports can be used for uplink and which transceiver should be used for 10GE copper uplink? for example, SG500x-24 switch has 24GE ports and 4x10GE uplinks. can i use the 4x10GE ports for uplinks or only 2 ports are for uplink and the rest for stacking?
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Nov 14, 2011
If I have two stackable switches one that connects to the 6509 core switch and the other switch does not, do I have to uplink the switch to the other switch so that switch has route to the core switch or because the switches are daisy chain there is not need to cable one switch to to the other switch connected to core switch?
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Aug 14, 2012
Is there a big difference in operating AP's when they are uplinked at 100mb vs 1000mb? We have 2 "main" offices that have AP's that are all connected to our access switches at 100mb. Recently with the addition of mobile devices, phones, etc we are seeing some issues. Today, we had a meeting room that had 20+ people connected to one AP and they started seeing issues of people getting disconncted or unable to connect.Just wondering if the uplink could have anything to do with this, or if we are just over subscribing the APs?
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