Cisco Switching/Routing :: Pair Of N7K Distribution Switches Connected To A Pair Of Aggregation Switches
Mar 11, 2012
We have a pair of N7K distribution switches connected to a pair of N7K Aggregation switches.We run vPC on both pairs of n7k's.
-n7k-d1 has two interfaces in a Port-Channel connecting to n7k-a1 & n7k-a2. (PC1)
-n7k-d2 also has two interfaces in a Port-Channel connecting to n7k-a1 & n7k-a2. (PC2)
My problem is that Spanning-Tree is blocking PC2 and all traffic from n7k-d2 is traversing the Peer-Link before reaching the Aggregation layer. Is this the best design for connecting two pairs of n7k's with vPC or if a better design would be to connect all 4 links into the same Port-Channel and vPC?
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Mar 21, 2012
I have two separate companys both with staff at two locations and thier own networks connected with a wireless antenna which provides a high speed LAN connection between offices. I only have a single path through this antenna bridge. I have an SG200-08 switch at each end. What I am attempting to do is utlise the switches to take the two subnets at one office, combine them to one for transfer through the antenna bridge, and then resolve them into the two separate networks again at the other end.
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Nov 6, 2012
There are two Cisco 4900M L3 switches and two Cisco 2960 L2 switches. I need to configure the two L3 switches to operate as a redundant pair, as the servers connecting to them are connecting using bonded interfaces, which can only have one default gateway. So these two L3 switches need to have the same Vlan interface 1, 2 and 3 IP's set onto them.How are the two L3 switches made aware of each other? via a normal trunk? Is there some special configration for configuring a mated/redundant pair of switches? or are they both just configured as though they were the same switch, but linked?
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Jun 8, 2012
connecting a 5548 pair to our core 6509s. Just want to be sure we don't introduce any issues into the network.The 6509's are connected and perform all the routing. Essentially, we're moving away from a 3750 stack in the data center and the 5548s are the replacement. We'd want to limit the vlans to the specific server network vlans. Our current setup is a port channel between the 3750 and each of the 2 6509s for redundancy. I'd like to use the same functionality when we connect the 5548's but I'm looking for what the config should look like to ensure no spanning tree loops are introduced and that it is configured optimally.
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Jan 9, 2012
My Data Center has one single core switch where is connected several servers, one port is the link to the router wan and other port is the link to the FW, my boss wants to install 2 nexus in order to replace the single switch. All my network has only one address, for example 192.168.10.0/24 if I connect two nexus 7010 in VPC and Domain, each nexus is going to has 2 modules with 48 port 10/100/1000 rj45 and i wan to connect servers directly to each nexus, with this figure i'm going to have a group of servers connected in two different nexus, Do they can have the same network 192.168.10.0/24 considering that the nexus are in the same vdc and vlan and have only one gateway for both groups? If the answer is positive, which nexus would be the gate way for that address, the primary or secondary? Or i must have a different address for both group of servers, i mean for example 192.168.10.0/24 and 192.168.12.0/24?thus each nexus would be the gateway for that new address?
To have two nexus connected by VPC in a Domain mean that one computer connected to one nexus can share the same address or vlan with other computer connected to the other nexus????
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Sep 5, 2012
whether VSS technology support on 3560 switches.I'm planning to intergrate new Cisco 2x6509 with VSS and all the access swtiches 3560's uplink to core 6509..if not support, what will be the solution or any bug fixing or new IOS releasing
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Dec 28, 2011
I've got a router on which I run a backup/media/print server, a couple of computers and a voip box. My router has only four ethernet lan sockets which are thus all occupied by the above, but I need to attach at least one further device b
Secondly, could a splitter such as >> this one << do the job? I'm guessing this basically split a single 4-pair ethernet connection into two 2-pair ethernet connections.
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May 3, 2012
I already know that there is an option using Patton Copper Link Ethernet extender to interconnect a remote LAN with this device. Do you know if this is possible using Cisco 888-K9 or any other Cisco Device ?
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Aug 31, 2009
We are running 4x n5k and started with the vPC feature. So my question is, if i can connect a vpc-pair to another vpc-pair?In the cisco docs i can find examples for connecting a vpc-pair to a single switch, or server (with and without fex)But there is nothing about how to connect 4 n5k via vPC feature.
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Aug 19, 2012
The 10G twisted-pair module for the Catalyst 3750-X is the two-port C3KX-NM-10GT. can these be used as access ports for a server with 10 G NICs?
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Jul 6, 2012
We have HSRP between NexusA and NexusB with access layer switches connecting to the core using VPC, We are trying to setup a VAM server Voice recording for Siemens phones. We need to span all voice vlan and point it to the VAM server the VAM server connects to a 3750 Stack considering the amount of traffic multiple span session can generate I plan to move the server to the Nexus directly and run a Local Span Session.
1- As we have two Nexus running HSRP and VAM server only connects physically to one NexusA (I can run local span on that nexusA) the Second NexusB is not directly connected to the VAM server I plan to run ERSPAN so if this is the best design and which path will the span traffic take from Nexus B to NexusA will it go through the access layer switches depending on the vlans allowed on the uplinks or will it go through the 20 Gig uplink between the two Nexus allowing all vlans (VPN peer links) ? WE have approximately 10 voice vlans, Do we an example config for ERSPAN session where the source are vlans (As I am for fimilliar with RSPAN) ?
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Mar 18, 2012
I currently have two Nexus 5548UP switches in my environment running the latest code (n5000-uk9.5.1.3.N1.1a.bin). Both of these switches are connected via a VPC Peer Link (two ports on each switch in an Ether Channel) and a VPC-Keep Alive Link (a dedicated port). Hosts connect to each switch via a VPC for both IPV4 and FCOE.
As of right now, everything works. I currently have a stack of two 3750 switches that each Nexus is connected to. This stack is doing all the Intra-VLAN Layer 3 Routing for the Nexus Switches. However, I plan to get rid of the 3750s, and move the Layer 3 Routing the Nexus 5548's, so the backplane is 10 Gig instead of 1 Gig.. I have the Layer 3 Daughter Card installed in both switches, as well as the LAN_BASE license.
So, at the moment, I am trying to find the best way to accomplish Layer 3 Routing on these two switches. Since the Nexus switches are not stacked, and the FCOE portion of HA is taking care of by the Multipathing agent on each host, I believe am just concerned with providing Intra-VLAN routing in an HA build where if one switch goes down, VLANs still route through the other switch.
Again, since the Nexus switches are not stacked, I am guessing the best way to handle this is with HSRP, but my experience with that has always been with routers that have a switch in the middle. Can I make HSRP work without having a switch between the Nexus switches? Can I track the VPC peer link, or how do I do it? I guess I am looking for a sample config.
Let's pretend I had two VLANs:
VLAN 20:
10.20.20.254 - GW and 10.20.20.0/24
VLAN 40
10.40.40.254 - GW and 10.40.40.0/24
And I wanted the Nexus switches to route these VLANs regardless of which switch was up / down..
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Oct 30, 2012
After rebooting a pair of 6504's configured for vss, both switches show active on the sup modules. A show switch virtual redundancy however shows the pair working in an active/standby mode. We have 6509's in vss pairs and they show active on switch1 and standby on switch2 led's. For the 6504's switch 1 was booted first and then the second switch about 30 seconds later. Is there something different with the 6504's? [code]
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Sep 30, 2012
The school I work at upgraded to Cisco Catalyst 2960-S switches, all connected to each other via fiber. I am seeing a problem with one such connection. Cisco Network Assistant showed a "4-Warning" regarding the fiber link port: port was disabled because it was fluctuating between up and down too rapidly. Possible hardware problem, resolve and re-enable. (I'm paraphasing the message...it was 'acknowledged', and I can't bring it back up.)
This message was only showing on our "SV-Copy-Rm" switch's port 49. The other end, on "SV-Maint-Rm" port 49 showed a normal green link status.
Using Internet Explorer, I logged onto SV-Copy-Rm switch's Device Manager, and I first tried disabling/re-enabling port 49 on SV-Copy-Rm. It came back up blinking yellow and showing "port has bad link" when I cursor hovered over port 49. This continued for a few minutes, followed by port 49 being disabled again.
The current thing I'm trying is swapping the connection on both ends to a spare pair of fibers. I'm pretty certain I've swapped to the same pair on both ends, however, now neither switch shows an active link. I've disabled/enabled the ports on both ends, but still no link.
Question: How do I re-establish the above link? (The active connection has 'fallen back' to the designated ethernet Cat 5e connection and is currently running with that connection.)
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Mar 5, 2012
I'm trying to setup Link Aggregation on this switch for an HP server with a 4-port NIC which is teamed. I create the LAG and see in the HP Network Utility where each port in the team disconnects then reconnects and the server has internet access, but workstations cannot access the server (can't browse UNC, RDP, ping, etc.) and vice versa. This is the only switch at the site, all the workstations are plugged into it. Rebooting the switch after creating the group didn't have any effect.
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Jan 29, 2012
I have client who has two distant offices with 3750 L3 as core (do all vlan routing for local office) and multiple L2 access switches with multiple VLAN’s connected to it. First 3750 is hub also connected to internet, second 3750 is spoke and acting as a router on stick. We have eigrp configured on both side ISP provided client 100Mbps link as a trunk with two vlan; vlan10 for voice and vlan20 for data. We assigned two small subnets to these vlans 10.15.17.0/29 and 10.15.17.9/29. Hub addresses are 10.15.17.1 and 10.15.17.9 respectively. How to force voice over VLAN10 and data via vlan20, but still do some load balancing? How to setup default route on second (router on stick) switch?
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Mar 5, 2013
I have 2 PE routers connected to each other via 2960S and 3750 (non-metro) switches:
[PE1] -- [2960S] -- [3750] -- [2960S] -- [PE2]
I will be sending voice and data traffic between the two and my voice traffic will be marked DSCP EF & EXP 5.
Since the 2960's and 3750's can't match on the EXP bits, I am wondering if the "mls qos trust dscp" command still works. Is the 2960/3750 able to match on DSCP even though there's an MPLS header on top of the IP packet?
I'd like to avoid having to tag my VLAN traffic on the PE and rely on COS to achieve QoS in this case.
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Aug 21, 2011
Having issues waking NAS devices using a magic packet when using link aggregation on an SG300-28 switch.
Without link aggregation everything works fine so I know the magic packet is being generated correctly and the NAS device is correctly configured to wake. After configuring link aggregation the device does not wake. Have tried dynamic (LACP) and static link aggregation but neither allowed the device to wake? When the NAS is powered off, the ports in the LAG still show as being connected at 100M but it appears the magic packet is not being transmitted.
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Jun 22, 2012
I have a Synology 1512+ and trying to setup Link Aggregation but no success. I have configured LAG Management with LACP enable or disable but still failed.
At the Synology 1512+ setting page, there are 2 options: IEEE 802.3ad Dynamic Link Aggregation and Network Fault Tolerance (Non-802.3ad network enirovement), I selected IEEE802.3ad, which i think S200-18 should be able to support. right?
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Jun 27, 2010
A specific switch port which happens to be part of a 2 switch 3750 Switch Stack is seeing multiple CDP packets from 3 extra switch port interfaces that are not directly connected. Noteworthy is that the far end devices have the correct CDP entries and I physically confirmed at least two of those connections that lead to the switch "upstream to the culprit switch". Tricky part is that its production so room for maneuvering is limited. At some point I disabled all Ports save for the real uplink and the problem momentarily disappeared. Re-enable the interfaces problem resurfaces. Is there an explanation, technique to eliminate the culprit with minimal disruption?
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Jun 4, 2012
I am troubleshooting a fiber connectivity issue.Now I have two switches, one is 3750, and another is small biz 300 series switch. Both switch has a single mode smf gbic. Now I have two swtiches face to face and connect with a single mode cable. Do you think if I would get a link light on? Both ports are no shutdown.
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Aug 14, 2011
answer regarding stacking the SGE2010 switches versus link aggregation if greater than 1 Gb connectivity is required between individual switches? Currently have several switches in a stack configuration but would like to increase the bandwidth between some or all of the switches. Does stacking support a link aggregation configuration? If so what ports can be used and how should the link aggregation be configured in conjunction with the stacking?
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Jan 16, 2012
find out which types of fiber optic that i can connect to three types of switches. the setup that i have that there are:8 access switches (WS-C2960S-24TS-S), in each one there is two SFP connections.2 aggregate switches WS-C3750X-24T-S, in each one there is four SFP connections.and one core switches that has SFP card WS-X4624-SFP-E? Note that the fiber optic that we have coming from filed are multimode.
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Feb 10, 2013
We are using CISCO Catalyst 6500 switches as collapsed core/distribution switches (2 layer architecture). I want to connect approximatly 10 application servers to the network. Can I connect the servers directly to the catalyst 6500 switches using WS-X6148E-GE-TX line cards? The other option is to use access switchs and then connect the servers to the catalyst 6500 through access switch(Catalyst 3750).
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Nov 18, 2011
If I have two stackable switches one switch uplinks to one 6509 core switch and the other connection uplinks to another 6509 core switch, and also the other stackable switch does not connect to the core switches. Because I am using hsrp and also we are not using vss then one uplink to the core is not in used only ones is so then how does creating an etherchannel between does two uplinks to both core switches benefit me in anyway such as more bandwith and using both uplinks at the same time or I'm I wrong?
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Nov 14, 2011
If I have two stackable switches were only one stackable switch has two uplinks one uplink goes to one core 6509 switch and the other uplink goes to the other 6509 core switch can a Layer 3 etherchannel be used if each uplink go to a different core switch, by the way hsrp is running between both switches and also can you give an example how data will be routed from the stackable switch through the ethernetchannel to one of the core switch accross the WAN to another core switch?
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Apr 20, 2013
We would like to install a pair of ACS 5.4 apliance as primary /backup in our two datacentres.I have some question regarding degin.
1- We have 800+ network device to monitor , can we install by range of address instead of instlling one by one in device host database ?
2- Do We have to install all 800 device first on Primary and then again on backup or Primary will replicate to backup server?
3- We do not have real IP address yet, so if we built with dummy address and make them pair and all the database sync, then when we change their IP address, will the distributed primary pair will have any issue with backup ACS server?
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Feb 7, 2013
For some weeks I have been trying to pair my Samsung Galaxy S2 with my Lenovo Thankpad SL500. The consistent message is "Unable to pair with [laptop]. Incorrect PIN or PASSWORD.
Well which is? PIN? or PASSWORD? - or does the system not know, so it's taking a guess? If it doesn't know, how can I possibly know?
Having read many articles about his on the www, I am still none the wiser as to what is causing this. What's wrong with the PIN or PASSWORD - is it too hot, or too cold? Wrong font face, colour or size? Wrong latitiude, longitude or elevation? Wrong time of day or month? Are the auspices in general not favourable? Am I facing in the wrong direction as I type? Have I chosen the wrong weight/color of paper for my printer? Is my body odor unacceptable? Is the length of grass in my lawn not quite right? Oh, the number of options is so large - where does one start?
Oh, and before I forget - assuming I can find what constitutes a correct PIN or PASSWORD, where does one set it? btw pairing this phone with the media player in my 10 year old car works immediately and flawlessly!
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Jan 14, 2013
Is it possible to run a large LAN over copper twisted pair cables?This is to connect 41 PC's that monitor fire systems on a large hospital site.I am trying to use the existing cable that is wired in a loop all round the site.
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Oct 31, 2012
I have a long 2 pair cat 5 cable which I want to use to connect a ADSL modem to my desktop (located in a different room). I took the cable to few local computer dealers but none of them could connect an RJ-45 connector to it. They can only connect a 4 pair cat 5 cable. Connect a 2 pair cat 5 Ethernet cable to a RJ-45 connector. Kindly use simple language. I have attached an image of the cable for your reference. [URL]
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Apr 17, 2013
I have 2 5508 that are currently running as active with 150 licenses each. I want to go to HA SSO can 100 of the licenses be relicensed to the primary since it only requires 50 licenses to convert an active license 5508 to standby HA SSO?
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Oct 31, 2012
i am trying to setup a failover pair on Cisco asa 5520 - need a state full failover. Do i need two ports dedicated to obtain the above - one for LAN based failover and one for state full fail over ? also do i need a switch in between to connect them ?
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Nov 5, 2011
I purchased a couple of used Cisco Routers and Switches and the guy gave me a bag with some cabling and one of these little guys were inside:
I have seen them plugged in before on images of peoples labs, but what are they used for? Why would I want to use this?
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