Cisco :: 6500 / 3560 / Nexus 5k - Syncing NTP
Mar 6, 2012
I have begun moving NTP from our 6500 to 4 Nexus 5k as part of a core upgrade. The Nexus will act as our internal NTP server for all switches. Any switches that are on the same vlan as the Nexus have no issues syncing NTP from them. However any switch that has to have the traffic routed to the Nexus is showing that the time source as insane.
The configuration on our Nexus is as follows the Nexus are .11,12,13 and 14:
ntp peer 172.24.1.12
ntp peer 172.24.1.13
ntp peer 172.24.1.14
ntp server 192.43.244.18
clock timezone CST -6 0
clock summer-time CDT 2 Sun Mar 2:00 1 Sun Nov 2:00 60
Here is the configuration on one of our 3560's:
clock timezone CST -6
clock summer-time CDT recurring
ntp server 172.24.1.11
ntp server 172.24.1.13
ntp server 172.24.1.12
ntp server 172.24.1.14
This same configuration worked when the switches were configured as NTP Peers to our 6500 (172.24.1.1). The ip for the 6500 has been moved to an HSRP address across the Nexus so I have pointed the switches at the individual IP for each Nexus.
Here is a debug ntp packet ouput from one of the 3560s:
.Mar 7 17:21:22: NTP: xmit packet to 172.24.1.11:
.Mar 7 17:21:22: leap 3, mode 3, version 3, stratum 0, ppoll 64
.Mar 7 17:21:22: rtdel 2445 (141.678), rtdsp C804D (12501.175), refid AC180101
[Code].....
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Apr 9, 2013
I have problem with syncing Nexus and NTP server. MGMT IP adress of Nexus is 10.24.130.137 and address of NTP server is 10.242.32.12, there is full routing and NTP readability between Nexus and NTP but Nexus is UN synced:
N5k-04-A# sh ntp peer-status
Total peers : 1
* - selected for sync, + - peer mode(active),
- - peer mode(passive), = - polled in client mode
remote local st poll reach delay
------------------------------------------------------------------------
=10.242.32.12 10.24.130.137 2 16 377 0.00310
Config of NTP is:
N5k-04-A# sh run ntp
!Command: show running-config ntp!Time: Wed Apr 10 14:41:35 2013
version 6.0(2)N1(2)ntp server 10.242.32.12 use- vrf management ntp source-interface mgmt0ntp logging.
I captured traffic with wire shark and see something strange in NTP Packet: "Reference ID: Un identified reference source '...'"
I have one Catalyst 2960 on same sub net and it's synchronized with same NTP without any problems. Here is snapshot of wire shark capture:
P.S. Don't bother about malformed packet, it's probably because of using ERSPAN.
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Jan 16, 2012
I have been trying to understand from a long time about the throughput capacities of variety of Cisco Routers and Switches. Have searched over a million pages on cisco.com for data sheets/documents/etc. but havent succesfully got a single document highlighting all of what i need.
I have got queries on the below issues:Which model of Router can support upto 2Gig's of WAN Internet connection running BGP? Any list of routers and switches supporting variety of throughput's from 1 MB to 1 GB.I have heard some experts stating "Switches don't have throughput concerns as they switch the traffic and don't need to route traffic" How true is the statement?? and if it is, Why do we require 6500's instead of 3560 Distribution Switches.
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Feb 1, 2011
we need to use Nexus technology over 6500 based VSS in entreprise ?
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Jan 2, 2012
I need to implement the shaping VLAN only on the trunk link between the 6500 and 3560. [code]
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May 30, 2012
We want to get L2 traffic amount (bit/byte) passing through a cisco switch (6500/3560 ...) for a specific VLAN. it can be via SNMP or CLI ...How can we do that?
note: there is no L3 interface on swtiches.
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Jan 23, 2011
The diagram below is the configuration we are looking to deploy, that way because we do not have VSS on the 6500 switches so we can not create only one Etherchannel to the 6500s.Our blades inserted on the UCS chassis have INTEL dual port cards, so they do not support full failover.
Questions I have are.
- Is this my best deployment choice?
- vPC highly depend on the management interface on the Nexus 5000 for the keep alive peer monitoring, so what is going to happen if the vPC brakes due to:
- one of the 6500 goes down
- STP?
- What is going to happend with the Etherchannels on the remaining 6500?
- the Management interface goes down for any other reason
- which one is going to be the primary NEXUS?
Below is the list of devices involved and the configuration for the Nexus 5000 and 65000.
Devices
· 2 Cisco Catalyst with two WS-SUP720-3B each (no VSS)
· 2 Cisco Nexus 5010
· 2 Cisco UCS 6120xp
· 2 UCS Chassis
- 4 Cisco B200-M1 blades (2 each chassis)
- Dual 10Gb Intel card (1 per blade)
vPC Configuration on Nexus 5000
TACSWN01
TACSWN02
feature vpc
vpc domain 5
reload restore
reload restore delay 300
[code]...
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Jan 11, 2012
We are cutting over from 6500 IOS to Nexus 7000 and have hit "Maximum ospf feature instance limit reached." as we configured up the 7 existing ospf processes - the limit is 4. These existing processes are for various vrf contexts we have. I see you can run multiple vrf contexts under one process - but how does that work in a mixed environment where the ospf neighbours are still ios 6500s? They still expect to see different ospf process id per vrf.
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Aug 30, 2012
y newly purchased 886VAW won't sync. The link ( ISDN ) I'm running it off from runs nicely on my crusty-trusty 803. I linked the box with the cables supplied against the splitter as usual but can't seem to get a stable CD light ( constantly flashing ). The box is intended to run against ADSL (with VDSL to come in a few days ).
Controller VDSL 0 is DOWN
Daemon Status: Establishing Link
XTU-R (DS) XTU-C (US)
[Code].....
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Aug 9, 2012
I'm trying to get ERSPAN working with an ERSPAN source on a Nexus 5548 and the ERSPAN destination on a Catalyst 6500.
The configuration on the Nexus is as follows:
[...]
interface loopback0
ip address 192.168.2.133/32
[Code].....
If I do a netdr capture I can see ERSPAN traffic sourced from the Nexus reaching the C6500, but there doesn't appear to be anything sent out the ERSPAN destination inerface (Gi4/6) and there's nothing being received by the probe connected to that interface. I know the traffic seen with netdr is definitely the ERSPAN traffic sourced from the Nexus as I've changed the TTL and DSCP values within the monitor session on the Nexus and can see those changes reflected on the C6500 netdr capture. The attached is a screen grab of the show netdr capture started with debug netdr capture soure-ip-address 192.168.2.133.
When I look at the interface I see it shown as up/down (monitoring), but no output or counters clocking up. If I run a local SPAN session on the C6500 it works fine.
I've tried changing the destination IP address from that assigned to the C6500 Loopback interface to an IP address assigned to a physical interface, but that still doens't work.
The hardware in the C6500 is WS-SUP720-BASE Hw version 3.2 with WS-F6K-PFC3B Hw version 2.4. The IOS version is 12.2(33)SXI6.
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Jan 16, 2013
We did a faulty ACE30 module swap in a HA pair. Both the ACEs have stopped syncing since then. Below is the error message I see:
FT Group ID: 1 My State:FSM_FT_STATE_ACTIVE Peer State:FSM_FT_STATE_STANDBY_CONFIG
Context Name: Admin Context Id: 0
Running Cfg Sync Status:Failed to convert/transform configuration to peer version
Both ACE modules are running 5.2 with the same license.sh ft peer status from both active and standby show the same results.
Peer Id : 1State : FSM_PEER_STATE_COMPATIBLEMaintenance mode : MAINT_MODE_OFFSRG Compatibility : COMPATIBLELicense Compatibility : COMPATIBLEFT Groups : 15
Am I missing something here?
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Feb 21, 2013
ACS5.2 time sync breaking once in near around one month and not able to authenticate after that .I am using domain controller (Windows Server 2008 R2) as NTP server for ACS .
What is the reason for it , is there any bug in 5.2 release or do i need to configure a thired device and point as NTP for ACS and domain controller.
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Jan 28, 2013
Is there any challenge to upgrade core switch 6500 series from Nexus 7009 which runs NxOS, because i have 3750X series switches connected at distribution and access layer in my network topology??
Is there any challenge if we place NxOS in core and IOS in distribution and Access layer??? how we are able to match sh run config in existing 6500 switch to Nexus 7009 NXOS?
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Mar 15, 2013
I have a HG-521 router which is syncing at 8724kbps, but it is slow loading pages. My isp is talktalk .
Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 32 bit
Processor: Genuine Intel(R) CPU 575 @ 2.00GHz, x64 Family 6 Model 15 Stepping 13
Processor Count: 1
RAM: 3063 Mb
Graphics Card: Mobile Intel(R) 965 Express Chipset Family, 2 Mb
Hard Drives: C: Total - 114370 MB, Free - 56821 MB; E: Total - 99 MB, Free - 61 MB;
Motherboard: ASUSTeK Computer Inc., X58L
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Mar 15, 2011
I have small WiFi home network based on WAG120N router. Two Macs, iPad, iPhone, two iPods etc and, unfortunately, endless series of problems. Devices can't see each other - iPad can't see iPhone and vice versa. Syncing of data between devices sometimes works but most of the time it don't. And so on, and so on... I have to restart WiFi on Mac and on iPhone to sync i.e. iBank data. PhotoSync between iPad and iPhone doesn't work but once (?!) it did.
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Dec 21, 2011
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Feb 23, 2011
We are facing issue of continous packet discards On nexus4001L link (int po2) to Nexus5020 switch. Nexus4001L is installed in IBM blade center server and we have FCOE enabled in this setup. [code]
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Mar 15, 2013
I have been tasked to replace the existing Cat 6500 and 3750 switches by Nexus 7000 and Nexus 2000.I was told initially my boss plans to get 2 x Nexus 7000 and then eventually blow up to 4 x Nexus 7000s.For Nexus, is there a list of tasks / points that i need to consider for building the initial design?
Can i just link the Nexus 7000 like the following?
N7k-A ========= N7k-B
| |
lots of N2ks lots of N2ks
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Dec 22, 2011
Struggle to find the SNMP MIBS of the Nexus 5000 FEX tranceivers.
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Nov 13, 2012
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Jun 19, 2011
We have a 3560 on our head office acting as an aggregare switch as well as Hub terminating remote wan links(one trunk link from provider terminated on FE port with several SVIs for remote location) and routing via OSPF. We have 1800 series at remote locations.
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How can I achieve my goal with 3560, Is it a good design to use 3560 as a Hub? our port utilization isnt that much..Wouldnt it be better to use 1800 or 2800 series?
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Jun 26, 2011
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Jul 8, 2011
I have a cisco cat 3560 and the present IOS is 12.2(46)SE and i want to upgrade the IOS to 12.2(58)se1.As there is only 8mb of frees space i cant straightly copy the new IOS on the switch. Any convenient way to Upgrade IOS.
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Jun 6, 2012
We have a problem with our WS-C3560V2-24TS running IOS c3560-ipservicesk9-mz.122-53.SE2.bin. The equipment keep dropping packets for no apperent reason.
This is what we are seeing:
LAN-port
Router0#sh interfaces fastEthernet 0/2 | include drops:
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 20595
WAN-port
[Code]....
We are shaping the gig uplink to 100Mbps, the equipment is dropping pakets randomly and not because the shaper kicks in and starts to drop pakets.
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Jan 25, 2012
I am trying to see how can configure MQC in Etherchannel. I know that i need to do this in the memeber physical interfaces of the etherchannel.The etherchannel is a trunk port allowing few VLANs. SVIs are created in the switch for this VLANs as well. tell me where i need to apply the QOS ? Is it under the member physical interfaces ?.
What will happen if QOS applied under the SVIs?
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Nov 6, 2011
I connected the AP [1140 - Version 12.4(21a)JA1, RELEASE SOFTWARE (fc1)] to the switch (3560) and the switch with the WLC (5500 series), but I get the below error:
*Nov 7 09:07:59.916: %DTLS-5-SEND_ALERT: Send WARNING : Close notify Alert to 192.168.10.22:5246
*Nov 7 09:07:59.954: %CAPWAP-5-CHANGED: CAPWAP changed state to
[Code]....
The access point cannot join the controller. Is this a misconfiguration at the WLC or something else?
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Apr 1, 2012
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Apr 28, 2013
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Apr 22, 2011
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May 28, 2013
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Apr 1, 2012
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