Cisco Switching/Routing :: N7K-M148GT-11 VPC Keep Alive Link
Feb 27, 2011
can assist me with some vPC design best practice. I'm trying to get my head wrapped around and build some engineering/configs together before my equipment arrives. I have two nexus 7010 boxes arriving soon.I will go ahead and configure the peer link using two 10g ports between the 7k's. Now how do I go ahead and configure the keepalive link.
1. use a copper dedicated single link using the mgmt ports on the supervisor for the keepalive?
2. use a copper port from 10/100/1000 line card (N7K-M148GT-11) for the keepalive?
Also this network will have a dedicated mgmt switch for all the devices to be managed. If I go ahead with number one (above), how will I use that port to manage that device?
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May 5, 2013
We setup two n7K as core switches in our network. We configure VPc peer link as well successfully. We are using mgmt interface of supervisors as a peer keep alive interface, so what happen when this keep alive gets down? Are we loss Vpc peer link between both nexus 7 K?
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Apr 19, 2013
I have a pair of Nexus 5548UPs that have some high priority servers running on them. Servers are ESX hosts running Nexus 1000v's. Each host has multple connections in a VPC to both 5548s. We have been having intermittant ping loss and slowness of traffic to the VM's on these hosts. I was poking around trying to figure out what the issue could be and found that the peer-keepalive command was not set to send the heart beat across the mgmt0 interface. I would like to change this to point it accross the mgmt0 interface. Any tips or advice for me on making this change with production servers running on the switches? I do not want to cause any loss to any systems when I make this change. [Code] ..........
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Mar 19, 2012
We have setup a pair of Nexus 5596 L3 switches with 2 x 10Gbps LACP links between them to act as the vpc peer link. We also have another 2 x 10Gbps LACP links between the 5596 switches to carry non VPC VLANs, this is required to provide EIGRP routing between the switches and an upstream router.I have read that it is possible to setup the vpc keep-alive link over an SVI instead of the management interfaces. Is it ok to run the keep-alive SVI over the second LACP non VPC VLAN trunk or is it recommened to keep this seperate?
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May 5, 2013
We setup two n7K as core switches in our network. We configure VPc peer link as well successfully. We are using mgmt interface of supervisors as a peer keep alive interface, so what happen when this keep alive gets down? Are we loss Vpc peer link between both nexus 7 K?
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Apr 29, 2011
I log in to work from home and if I am inactive for 5-10 minutes, I lose connection to my work server. If I bypass the router, this problem doesn't happen. How I can change settings to keep my session alive?
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Apr 12, 2009
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Apr 13, 2011
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Oct 20, 2011
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Sep 20, 2012
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Dec 19, 2011
We have several RV082s here which are intended to connect to a central ASA5510 firewall. The VPNs are configured and do work basically, however in our test environment the RV082s kept crashing after an apparently unpredictable amount of time (sometimes after several days or even weeks). All the RV082 have the newest firmware installed (v4.1.0.02-tm).
When further investigating the issue, I found out that the crashes can be reproduced when enabling the keep-alive option on the RV082. When powering up the RV082, they boot, start up the VPN, and then they crash a few seconds after the tunnel has been established (one or two pings usually get through). When crashing, the RV082 becomes completely unreachable, ie no ping, no webinterface etc.
There is a note in the firmware release notes saying that enabling the keep-alive option would not work the way it should. However it seems that enabling that option lets the router completely crash after its next reboot. This makes the keep-alive option basically worthless, however we need this since the routers will get installed at remote sites with no personnel available there.
Is there any way to enable the keep-alive option without making the routers crash immediately after startup?
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Oct 11, 2011
I have a dual wan router with a main cable modem for high speed and a backup adsl modem hooked just in case. The problem is that quite often it seems that my ISP loose his connection to the internet but communication is not lost between my ISP and my modem and router. Because of this, my router doesn´t do the automatic changeover from my WAN 1 to my WAN 2 hooked slower ADSL modem. My router has the ping to keep alive option checked on the WAN 1 setings using my Cable ISP provided IP address.How can I force my router to notice that my cable ISP lost his connection to the internet and do right away the changeover from his WAN 1 to his WAN 2 input?
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Jul 31, 2012
I got a pair of new C3560X-24T-S switches with C3KX-NM-10G modules, and am trying to get a long distance 10G link up using 3rd party SFP-10G-ER SFPs (XGIGA with Cisco coded IDPROMs)I've enabled use of unsupported transcievers with the following commands:service unsupported-transceiver no errdisable detect cause gbic-invalidAfter that the switches accepts the SFPs but I get no light (sh int trans shows Tx -40), but if I insert a supported SFP first and then switches to my ER SFPs I get them to start transmitting, however I still don't LINK on the interface.I've tried with both 12.2(55)SE3 (that the switches came with) and 15.0(1)SE3 with same results.I know SFP-10G-ER SFPs are not supported on these switches, but are scheduled for the 15.0(2) release, but I was under the impression that they should already work using the above commands to enable the use of unsupported SFPs.So my question is basically: Is the new code in 15.0(2) really needed to make ER SFPs work, so I should just wait for that release, or are my 3rd party SFP simply broken/un-compatible with these switches?Also, could reprogramming them to look like SFP-10G-LR SFPs, which are supported, make any difference, or should it already have worked now with service unsupported-transceiver enabled if they were compatible?
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Dec 6, 2012
i have server with two uplink to pair of 6500 non-VSS, this server member of vlan 100 sw-1 is active HSRP while sw2 is a standby HSRP , how can i make this server forward traffic on both Link . the server admin told me only one link is active (green) on the server while the other link is orange
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Jun 25, 2012
What is the function of the VPC peer-link? Should be the composite of all VPC links that are dual homed between switches? is it necessary to have 8 x 10G links as shown above. The links connecting the 7Ks to the 5Ks are VPC links.
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Nov 7, 2012
I've a problem with my 871W. I can connect to the router by inside interfaces (LAN & WLAN) but not on WAN (Fa4). My client on the WAN is on the same subnet and I can ping 871.
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May 10, 2012
We have a switch that continues to get unidirectional links. The fiber run is very long and is working off of legacy infrastructure. We have one uplink that can sustain 100MBPS trunk link. However, the moment we plug in the second redundant uplink the port will error disable for unidirectional link. We have tested all of the patch cables involved on the run, replaced the catalyst 3560 v2 switch, and even had a contractor come and out verify the fiber was good between the buildings. No matter what the link will come back as unidirectional. Or any troubleshooting steps we could try next? We have UDLD port aggressive enabled on both the switch interface and the interface on our distro router.
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Jan 22, 2013
We have two 3750 stackable switches in core layer.
1. We are planning to stack two 3750 for greater bandwidth to use
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which solution provides increased bandwidth and redundancy?
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Sep 16, 2012
if my SA520w will support link aggregation for network devices within my LAN. If so, is there a Cisco wiki or how-to on how to setup this up in the SA520w? I only find a brief mention of this in Section D of the manaul.
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Nov 29, 2012
how to go about config my bureau connected to HQ and separated by a WAN link of 60mb.
This is my plansplit into halves that is 30 mb for LAN connections, internet and file serving for strictly video streaming, bureaus have routers 2800 conected to HQ HQ has a router 3900
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May 3, 2012
I just upgraded all of our switches on campus to Version 15.0(2)SG4 after about a month of testing. On two switches so far, we are seeing that clients can not connect, and the switch isnt detecting a link. I dont see anything out of the ordinary in int status, port-security, or errors on the interface. Plugging in a different computer does nothing. Only thing that works, is a shut, no shut of the interface. After that, its connected.
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May 6, 2013
I want to use 4506 to track link 1 so that if it fail the traffic will use link 2 to go to ASA firewall. Switch_1 and Switch_2 is configured to use VRRP where Switch_1 is the primary.Current configuration (which im not sure about it):Switch_1track 1 interface gigabitethernet2/3 line protocol.
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Jan 27, 2013
I have implemented in my company network recommended by cisco scheme with MEC etherchannel from some segment distribution layer (VSS) to core switches (legacy 650x) exactly as on picture: Core switches have rather old IOS (Version 12.2(33)SRB4 and i have reasons not to upgrade it now) which dont support many functions - like BFD over Etherchannels and Enhanced PAgP. And we run a OSPF/MP-BGP/MPLS bunch over those links with OSPF reference bandwidth configured to such values that failure of one link in etherchannel will not lead to link cost changes (we dont have a lot of traffic for now on those links and 1 link can handle it easily) and consequently will not trigger changes to RIB and BGP topology table.
Problem is that i am afraid that in case of one of link of portchannel will fail (but without port down event - unidirectional link or smth else) it will take rather long time to converge - and im talking about L2, not L3 protocols. Cos i cant implement BFD and ePaGP over this link - best i can do that improve 30 seconds PAgP hello timer to 1 second. But at least 3 seconds of possible traffic blackholed - is rather big problem.First time i considered 2 possible solutions:
1) BFD - but even i can use it, it will not improve much recovery time cos 750 ms for BFD over etherchannel not much better that 1 second PaGP fast timer.
2) ePAgP - as i understand this protocol have enhancements to discover failed link faster and improve recovery time, but all information i can find about it - is how to use it for dual active detection and none about timers improvements. So i cant be sure that i should upgrade IOS on Core switches and it will improve my failure detection time. ( if it possible adduce some links to description of this protocol enhancements in comparison with PAGP)
For now im already thinking about using four L3 links (instead of 2 portchannels) and BFD over those links with 50 ms hello timer. But in case of link failure reconvergence of OSPF will take some time, and BGP will react to this no immediately, so i am afraid that even using aggressive timers for routing processes and hellos i will not win much time.
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Aug 5, 2012
For etherchannel of 2 links on a 3750 switch, if 1 link ever gets saturated, will the other link be used as well if the excess traffic is part of the same flow?Or that excess traffic will simply be dropped?
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May 12, 2012
I am trying to connect tow 3560X using a fiber cable (MM)I have C3KX-NM-10G in both switches (4 ports module)I have GLC-SX-MM in both switches (connected to G1/1)both switches are able to see & recognize the NM as well as the SFP.
Fiber Cable is tested Fiber Patch Cord also tested both ports configured as a trunks but also the switches are not able to see each other (even when I removed the trunks configuration from both of them)CDP neibour is showing nothing no links & no LED blink in any switch both switches are running c3560e-universalk9-mz.122-55.SE3 IOS?
There is no any other configuration in both switches.
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Sep 6, 2012
there is something I find strange on C6500 about QoS: C6500 derive an internal DSCP value for it's internal use, but when configuring the qos mapping on output interfaces, only a cos value (I guess, an internal cos value) can be used. Is it a misunderstanding from me, or is it really illogic?
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Jan 8, 2013
We have FEX (2232TM) connected with 2 x NEXUS N5K-C5596UP.
One port Ethernet 101/1/7 which was connected to Dell Server went down...
It was working for a couple of weeks at least. Then the link went down and now I'm unable to get anything connected to this port As I said, this already happened before, but unfortunately I can't remember if it was on the same port/fex ... from the fex uptime it seems that this was on another fex I was able to get the link back up by doing a power cycle of the fex
At the moment Dell server is connected to different port Ethernet101/1/4.. See config bellow:
. config, how ports are configured
interface Ethernet101/1/7
description VM008 Network 1
switchport mode trunk
[Code].....
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Oct 9, 2012
Four 6500 connected to each other to form a full mesh. Switches 4 and 7 is running eigrp. A question came up, why didnt it have eigrp on SW 2 & 3 ? Will it still be redundant if link between SW3 and SW4 is removed? If redundancy is working, SW3 should be able to find its way to SW4 via SW7 or SW2, yes?
The config looks:
SW4 eigrp
router eigrp 100
network 192.168.0.0
redistribute static
auto-summary
[Code]....
Recently, the eigrp was configured to SW 2 and SW 3 as well, it included the “redistribute static” statement. The route for SW2 and SW3 now has the VLANs, 51 or so. Sent ping from a PC to VLAN1 IP of SW3, then link between SW3 and SW4 was disconnected, network connectivity went down for about 20secs, and ping came right back. Thought it was a success. All of a sudden, outside connectivity was lost. Ping within the LAN was successful, but no internet connection.
The eigrp on SW2 and SW3 was removed, and the internet connection came back up. The initial concern was that although there is physical redundancy in place, the other routes may not be known. Hence, eigrp configuration has been attempted for SW2 and SW3. Perhaps the “redistribute static” should have never been configured on SW2 and SW3, SW7 does not have the “redistribute static” statement anyway.
Without eigrp running on SW2 and SW3, does it still have redundancy? For what it’s worth, SW4 and SW7 are both VTP servers. With the current configs, does it still have redundancy? Link redundancy was never tested; it always has been assumed that it works. Later today, with it’s current config, the link redundancy will be tested.
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Jan 3, 2013
i am in process of building a new datacenter with 2 nexus7k in core/aggregation and 2 n5k in access layer. I am running fabric path on F2 cards between 7k and 5k, also enabled vpc+ on 7k and 5 both. There are few vrfs on 7k which are communicating with each other through firewall contexts. Now there are few vlans which are used to connect differnt vrfs and firewall contexts on n7k and running hsrp as well. now since these vlans are not traversing FP network i should not logically configure these vlans as FP vlans. But since the vpc+ peer link is a FP link it will not allow non-FP vlans to communicate through itself. I have configured a vpc trunk link between 7k and fws. Diag is attched. Now my question is can i configure vlans used for connecting vrf and fw contexts as FP vlans so that hsrp running between those vlans can communicate with each other over vpc+ peer link on n7k.
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Mar 3, 2012
We have branches all over the country and we take different links like fiber (Ethernet) radio links etc. Now sometimes when we ping from branch WAN ip to its gateway or to the aggregation router (ASR 1000) in this case, we see some drops, but see no problem in actual HTTP or lotus communication.
What i want to know, that now a days, should we rely on ping results to determine link quality ? or should i use tools like iperf to basically see if the link is actually treating tcp and udp packets properly, I have heard this countless times that normally network devices like Cisco routers, even without any QOS, will give low priority to ping packets.
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Jan 8, 2012
I have two 2960 switches connected with two links. One of them is transparent modem connection with 2Mbps limit, and the other is optical link with media convertos on both sides. Is there a way to set up etherchannel, LACP or any other kind of link transparent to switches or I have to use some sort of STP?
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Apr 29, 2012
I have a Cisco 3560X 48 port Ip base switch with v lan configured and ip routing. Ports 1 and 2 are in ether channel and routed ports to ASA and have their own network of 192.168.22.49/30. The ASA is configured with the same config for ports 1 and 2. The channel group ip address on the 3560X is 192.168.22.49/30 while the other end of the up link is the ASA and its configured with .50/30.
I have 6 v lans plus the one native v lan. They are all configured with ip addresses. Each V lan should be able to talk to one another other than DMZ v lan which is trunk and routed directly in the ASA. On the switch I can ping the IP address on the ASAs up link .50/30 but I cannot ping the ASA from any host on any of the V lans. My switch config file is posted below. The ASA seems to be able to ping any host in the VL ANS due to static routes that are in place. Why I'm not able to communicate to other v lans or even ping the ASA?
Config for 3560X
L3Switch#sh run
Building configuration...
Current configuration : 8056 bytes
! Last configuration change at 00:45:43 UTC Mon Mar 8 1993
version 15.0
no service pad
[code]....
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Aug 7, 2011
I have two Cisco 6500 switches connected via fiber, this is my small network. One end goes to a provider, and the other end goes to a server. My IT department wants some sort of link state propagation since the provider keeps going down, but the IT team is unaware until they contact me.
We provide a Layer2 point-to-point circuit, access ports at the ends. We use V LAN's to transport the traffic. Please let me know if there is anything I could do to support link state propagation.
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