Cisco WAN :: ICMP Packet Drop On Nexus 7018

Mar 9, 2011

I am running ping between two Nexus 7018 over WAN link ,and I can see some set pattern of packet drop(7.40 % drop) with MTU size 1500.When I ping between my 6500 VSS pair and same Nexus 7018 over different SP WAN link on diffrent location , I am still getting same kind of packet drop (8% drop) with MTU 1500. Has any one else come across this issue with Nexus?

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Cisco WAN :: IOS Upgrade On Nexus 7018?

May 5, 2011

I am trying to upgrade IOS on my Nexus7018 from version 5.12 to 5.13. I have managed on all my three out of four Nexus succesfully but one of them is keep coming with this error,
 
""""N1K-7018-1# install all kickstart bootflash:n7000-s1-kickstart.5.1.3.bin system bootflash:n7000-s1-kickstart.5.1.3.bin
 
Another install procedure may be in progress. Please try later.
 
how to find out which other install is running or stop any install procedure.?

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Cisco WAN :: Object Tracking In Nexus 7018 Platform

Oct 30, 2011

I'm going to replace a Cat6513 with a Nexus 7018.  In my Cat6513, there are object tracking config as follows:
 
ip sla monitor 1
type echo protocol ipIcmpEcho 112.78.254.249
timeout 3000
frequency 6
ip sla monitor schedule 1 life forever start-time now
 
ip route 172.17.7.0 255.255.255.0 165.202.51.46 name VPN-1 track 123
  
Is there similar feature in Nexus platform?  Because from Nx-OS command ref, I only found:
 
ip route ip-prefix/mask {[interface] next-hop} [preference] [tag id]
 
Seems can't associate a track object to a static route in Nx-OS?

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Cisco Switching/Routing :: Trying To Do VACL On Nexus 7018

Mar 4, 2013

We have a Nexus 7018 with NX OS 5.2(1), and we were trying to understand somehow the steps to do a VACL, we know that in IOS it would be:
 
interface GigabitEthernet9/33
description Puerto. Captura
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 19,20
[Code]...

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Cisco Switching/Routing :: Nexus 7018 To WLC 5508 QoS - Portchannels?

Dec 11, 2011

how to configure QoS on the portchannels from the nexus up to the WLC 5508's?

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Cisco Switching/Routing :: Unicast Flooding On Nexus 7018

Nov 28, 2011

I have a serious problem with nexus 7018, there're unicast flooding on one n7k, named n7k-1, which is the member of vPC domain combined with 2 N7Ks. [code]I had clean the mac-address-table, and all mac-address-tables had been synced fine, and the unicast flooding went away.

How could I fix the mac-address sync function between the modules ?

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Cisco Switching/Routing :: Ejector Open On Slot 19 On Nexus 7018

Jan 15, 2013

I've got this syslog alarm from nexus 7018. I am wondering what the slot 19 is here.
  
2013 Jan 15 23:59:22 r1 %PLATFORM-3-EJECTOR_STAT_CHANGED: Ejectors' status in slot 19 has changed, Top Ejector is OPEN, Bottom Ejector is CLOSE
2013 Jan 15 23:59:24 r2 %PLATFORM-3-EJECTOR_STAT_CHANGED: Ejectors' status in slot 19 has changed, Top Ejector is CLOSE, Bottom Ejector is CLOSE

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Cisco Switching/Routing :: Nexus 7018 Support Dhcp Server?

Oct 26, 2011

Can I configure a DHCP Servero on the Nexus 7018?

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How To Test Packet Drop

Feb 4, 2013

IXIA----DUT-----IXIA
| | |
|_______ |________|

DUT has redudant connections to IXIA. Im pumping traffic from IXIA and traffic takes PATH A .. When I shut PATH A, i expect traffic to shift to PATH B within 100ms (example). How do I test this ?

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Cisco WAN :: Packet Drop In E1 Link?

May 22, 2012

I having a basic query in troubleshooting E1 link , here im facing packet drop in the link and we are testing by providing local loop and remote loop from the CSU/DSU at local point and at  remote point . I have tried  ping test while the loop is given at local point and remote point ie i have pinged my local serial interface IP address (eg 10.0.0.1 -local  & 10.0.0.2 -remote ) in Remote Loop  i could see no errors and drops and also the traffic on the interface output and input is the same(eg input rate 1000bps and output rate  1000bps) .My query is that when i am pinging the local interface IP does the icmp packet  travels till the loop point  and comes to the same interface(like a boomerang) .

ICMP packet
    ->->->->->->->->->->->->->->->               
R1         Local CSU/DSU             |  Remote CSU/DSU (remote loop given )
 
O-----------O------------------------------O |--------------------------------------O R2
    <-<-<-<-<-<-<-<-<-<-<-<-<-<-<-|

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Cisco WAN :: ICMP Packet Can't Transit Between 7609 Router

Jul 11, 2012

We have two 7609 routers at different city . Our both 7609 routers make MTU 1800 bytes and when I ping the other router with  packet (1500 bytes) ,it can get thought .But when I ping with 15000 even 1506 bytes ,it didn.t work .As I didn't  disable the DF field .
 
Internet address is 202.112.38.54/30
MTU 1800 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 96/255, rxload 81/255

[Code].....

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Cisco Switching/Routing :: Packet Discard On Nexus 5020 Link To Nexus 5K

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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Cisco WAN :: 1841 / Packet Drop In Ipsec Tunnel?

Oct 23, 2012

I have a 1841 router connected to an ISP (currently SDSL EFM 10Mbps through an ISP modem, the router and the model are connected with a FastEthernet interface). On another location I have a linux server.There is an ipsec tunnel (3des-sha esp) between the router and the linux server (actually done with a crypto mac).The router has a hierarchical QOS policy on the egress interface.When sending traffic from the network inside the router to the linux host without the ipsec tunnel, everything is working fine and throughput is correct.When sending traffic from the inside network to the linux host internal ip through the ipsec tunnel, some packets are lost and the traffic throughput decrease.When sending traffic through the tunnel in the reverse direction (from the linux host to the internal network), everything is fine.I looked at the QOS statistics and the dropped packets counters don't increase. I looked at the egress/ingress interface statistics and no packets dropped there.I lowered the MTU on the egress interface, but it didn't solve the problem. I played by sending various ping icmp packets size, but even small packets are sometimes lost.I tried to check the router CPU, but it seems relatively fine (<= 10%)I captured the traffic on both side, and I see the packets emitted, and then I can see that some of the esp packets of the corresponding side are not received, so it looks like the cisco router is the culprit. This 1841 router is running: 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(24)T4,How can I troubleshoot where and why those packets are lost?

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Cisco Routers :: VPN Tunnel Between 2 RV042 / SSH Drop Packet

Dec 14, 2011

here's my setup :
 
office 1 :
rv042 hw3
ISP:Obtain an IP automatically
 
office 2 :
rv042 hw3
ISP:PPPoE
 
VPN tunnel between both rv042, everything's fine but when i try to ssh from office 2 to an office 1's server, my connection drops.
 
When it drops, i can still ping pc in office 1, this is really strange!if i change the office 2 ISP to another provider (obtain an IP automatically) everything's ok !
 
i try to use another PPPoE ISP for office 2 and it's doing the same thing!I've also tried other rv042 in both locations with the same setup and it's doing the same thing, so it's not a router issue.
 
i've tried older firmware and it's doing the same thing, so it's not a firmware issue!

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Cisco VPN :: ASR901 Support IPsec - Cannot Encrypt ICMP Packet Back

Apr 25, 2013

I'm trying to setup a GDOI based IPsec connection between a cisco AS901 (advanced Metro lic - asr901-universalk9-mz.152-2.SNI ) and a 7606-S.What I see is that the ASR901 is capable of decrypting the IPsec packet but I cannot encrypt the ICMP packet back, so the question is if the AS901 can support IPsec in software. What I could not find in the docs on CCO. [code]

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Cisco Switching/Routing :: 6509 Randomly Drop Packet

Nov 1, 2012

My workstation(10.0.0.250) directly connected to 6509_1 switch. 6509_1 is gateway with ip 10.0.0.5/22. Sometimes routing stop working, but after 3-5 minutes all back to normal.When issue occur i can't ssh to 6509_1, but i connect to second 6509_2 (10.0.0.6) and i can ssh to 6509_1 from it.Then form 6509_1 i try to ping my workstation Wireshark on my workstation show that packet arrive. My workstation reply on it, but switch not accept it.How it possible? As I say after sometime all go back to normal without any changes. [code]

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Cisco Firewall :: 887VA-W Keep Getting Drop Packet Error Message

Jul 13, 2012

I have an 887VA-w connected at home. I am using ip virtual-reassembly an all interfaces (dialer and all internal VLANs), I am also using CBAC (currently setting up ZBF). The issue I am having is that I keep getting drop packet error messages and the reasons can differ. Below are some of the outputs I recieve: [code] I have done a show ip virtual-reassembly on all the interfaces and the counter is shown as 0.

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Cisco Switching/Routing :: Trigger Packet Drop On WS-C4948

Feb 25, 2013

I am running  (cat4500-ENTSERVICES-M), Version 12.2(53)SG2 on the switch. I have a scenario where I have 3 end user equipments connected to a Cisco 4948 L3 switch. At the switch end port 1/46, 1/47, 1/48 are the terminating points for these 3 devices . I have added these three ports to VLAN140 (switch port access vlan140 on the gig interfaces).

The device connected to 1/46 is the one I'm testing some signalling features on. My requirement is to have intermittent packet drop on this interface so that my signalling associations would go down now and then. I'm trying to simulate a real-time network congestion/latency/packet drop in a simple manner.

I do not want to shut/no shut the 1/46 intf to cause this. Some way to achieve intermittent packet drop on this gig1/46 intf ?

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Cisco Switching/Routing :: 3845 Output Packet Drop In Some Of Interfaces

Nov 27, 2011

In my cisco 3845 router I can see output packet drop in some of the interfaces.I suspect that router is processing packet beyond its mix throughput limit. Moreover when i run show int fax/y switching command I can see packet drop by RP process.

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Cisco Switching/Routing :: 3950 - High Latency And Packet Drop Towards Access Switches?

Jan 27, 2013

My network Infrastructure consists of 2 core switches(cisco 3950, 24 port) and 3 access switches (cisco 2960G, 48port). No distribution layer.Both Core switches are connected to the BVI of a VPN router.PVST is running in all switches. The STP results are all good. We have 3 VLAN's in the LAN an IP routing is enables in the core switch. The network diagram is attached.
 
The issue we are facing is that , we get intermittent packet drops while pinging towards the access switches, and there is always a higher latency towards these assess switches.These issues are present even with no other users using the LAN. But these issues are not present while pinging towards the GW.
 
I guess, it is because of this, we have issues the accessing file server in the LAN. How do we go ahead with the troubleshooting. Will upgrading the IOS resolve this.The present version details is..
 
WS-C2960G-48TC-L   12.2(44)SE6           C2960-LANBASEK9-M

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Cisco Switching/Routing :: 7200 - QoS Input Policy Doesn't Classify ICMP Packet Based On DSCP

Dec 20, 2011

I have made some test and i noticed that qos input policy does not classify the icmp packet based on their dscp.The "match dscp ef" or "match precedence 5" is not working only the "match protocol icmp" shows hits.
 
We need to classify the different icmp packets based on dscp ( TOS ) for measurement purpose.CISCO 7200, 12.4.25d and 12.4.20T have a same behavior.

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Cisco Switching/Routing :: 6500 Ping Packet Drop From Core-Switch To Directly Connected Server

Oct 24, 2011

I have an Cisco 6500 CS and there is a Cisco Unified Communication Manger Server connected directly to the Core Switch.I tried to change duplex and speed ( fix and auto ) for both sides, but the same problem.

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Cisco Switching/Routing :: Nexus 5500 Duplicate ICMP Echo-replay

Nov 24, 2012

I am experiencing inconsistent echo-replay from devices connected via VPC to Nexus 5500s while pinging from the Nexus exec prompt.

In some cases I receive normal response when pinging from one Nexus,  but no response when pinging from the other switch. In other instance I receive normal response to one Nexus, and duplicate replays to the other. It looks like a VPC related bug. NXOS is 5.1.3.N2.1
 
5501# ping 10.12.12.232
PING 10.12.12.232 (10.12.12.232): 56 data bytes
64 bytes from 10.12.12.232: icmp_seq=0 ttl=253 time=8.585 ms
64 bytes from 10.12.12.232: icmp_seq=0 ttl=254 time=9.227 ms (DUP!)
64 bytes from 10.12.12.232: icmp_seq=1 ttl=253 time=1.011 ms
64 bytes from 10.12.12.232: icmp_seq=2 ttl=253 time=8.097 ms
64 bytes from 10.12.12.232: icmp_seq=2 ttl=254 time=9.429 ms (DUP!)
64 bytes from 10.12.12.232: icmp_seq=3 ttl=253 time=18.195 ms
64 bytes from 10.12.12.232: icmp_seq=4 ttl=253 time=8.807 ms(code)

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Cisco WAN :: Nexus 7K Ping Packet Loss

Nov 21, 2011

I am pinging a host from Nexus 7K.  I'm losing every 200th packet when I'm pinging the end host.   I don't see any issue with network connection.

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Cisco Nexus 4 - Ping Gateway IP / Getting Packet Loss

Nov 2, 2011

In my network i have Cisco nexus 4 switches those are running as redundancy and fault tolerance. I have mulitple VRF instances are running, when i tried to ping the gateway IP (hsrp Virtual IP) witch same VRF instance it is getting packet loss.

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Cisco WAN :: 7018 - Mix And Match 1 And 10 Gig Ports In Two Different VDC?

Feb 21, 2011

We have pair of Cisco Nexus 7018 with four eight port 10gig modules.I have created two VDC's with mixing 10gig ports from diffrent modules.Now we requied some one gig SFP ports and we are planning to buy 48 port 1gig sfp+ card.My question is can
 
1- Can I still mix and match 1gig and 10 gig ports in two different VDC's? (1-24 for VDC1 and 25-48 for VDC2)

2- All 48 port module hve to allocate to one VDC which alreday have all 10gig ports.

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Cisco WAN :: Advertising BGP Route Learned Back To Same AS 7018

May 18, 2011

I have a situation where my Internet edge routers learn 0.0 from ATT (AS 7018) my provider.  I then wish to advertise these learned routes via WAN.  However my WAN MPLS provider is also ATT and they use AS 7018 for that as well.  When I try to push 0.0 to my other WAN sites 0.0 is suppressed to avoid loops.What's the best way to tell the WAN routers to advertise 0.0 back to the same AS originally learned from?

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Cisco Switching/Routing :: 7018 Is VPC Peer-switch Command Intrusive

Apr 3, 2012

I need to enable vPC "peer-switch" command on a pair of Nexus 7018s which are currently vPC peers (primary and secondary). The STP root and Secondary root are currently configured  across these switches.Can I enable the peer-switch command in this configuration without impacting services, and then modify both switches to have the same bridge priority without impacting services ? We have a few downstream 5ks which are not dual homed to both vPC peers (work in progress) so need to understand if the peer-switch command will in any way break this connectivity for now.

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Cisco Switching/Routing :: Nexus 7000 With Fabric Extenders Nexus 2000?

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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Cisco Switching/Routing :: Nexus FEX Transceivers SNMP MIB Nexus 5000

Dec 22, 2011

Struggle to find the SNMP MIBS of the Nexus 5000 FEX tranceivers.

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Cisco Switching/Routing :: Datacenter Design With 2 Nexus 5K And 4 Nexus 2K?

Nov 13, 2012

we are planning a Nexus datacenter project with this layout:Our experiences with Nexus switches are not so large until now and the manuals are very extensive.Both N5K´s should be connected directly with all 4 N2K switches. I did not find a layout like this in the manuals. Only a design,where only 2 N2K are connected to one N5K, with this fex config:Now I´m not sure if it is right to make a config like this with the same slots and fex´s or with different slots and fex´s.

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Cisco :: ICMP Through ASA 5520?

Jan 26, 2012

I cannot seem to ping between devices on two networks hanging off a 5520 unless I use the same-security interface command. I have the relevant ACL's set up between the interfaces, but it just doesnt work unless I have that command in - if I use that command, it bypasses the ACL.

Config

interface GigabitEthernet0/0.224
description NMS
vlan 224
nameif NMS
security-level 100
ip address 10.11.120.225 255.255.255.240[code].....

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How To Use ICMP Protocol

May 29, 2011

I want to know how to use ICMP protocol in sending a packet in a network ?

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