Questions tagged [cisco]

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15 views

How does one access the Cisco Nexus 5000 terminal?

How does one access the Cisco Nexus 5000 terminal? There is a console port on the back and connecting directly to it does nothing; does it require a supervisor module or something?
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Cisco erase nvram or erase startup-config doesn't work

According to this article, I can delete the current startup configuration files and return the router to its factory default settings with the erase nvram: and reload command. https://www.oreilly.com/...
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Cisco Time-Domain Reflectometer (TDR) returns cable length of 65535 meters?

Something very strange here. Today I noticed a device was unreachable. Giving a look at the switch it connects to (Cisco 3750), the port was in err-disabled due to link-flap: #sh int g1/0/15 status ...
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Can't connect VM's brouser to Internet in GNS3 [closed]

I have a problem with connection Windows VM to internet in GNS3 I've configured nat and dhcp on cisco router. VM can ping 8.8.8.8, but can't "ping google.com". Dns on router is enabled, and router ...
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2answers
19 views

Fiber dBm transceiver power level at warning

We have cisco nexus 9000 and one of 40G interface showing port transceiver power level at warning when i check on command line i found following. Question: what is the normal power level for ...
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35 views

Issue w/ Cisco router and failed NAT and static default route

I have a cisco router that is using a VRF to support a site to site VPN tunnel. I have added a second network to the router for non-VPN standard internet use. My problem is that my default static ...
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7 views

layer 3 MPLS and Internet link up and down freequently in cisco 1941 [closed]

I have my CISCO 1941 series Router, i create two sub-interfaces which passing internet and MPLS traffics respectively, but recently days i experience a certain scenario where by either of the ...
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1answer
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Cisco APIC routing protocol status via CLI?

ACI Path Tenants > Networking > External Routed Networks > In the area with the routing protocol check boxes, there are a few options such as BGP, OSPF, and EIGRP. In this image, BGP and ...
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1answer
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Cisco APIC AAA TACACS+ Management via CLI?

In APIC, the implementation of AAA can be seen in the following path: APIC > ADMIN > AAA > RADIUS Management > RADIUS Providers APIC > ADMIN > AAA > TACACS+ Management > ...
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1answer
15 views

Cisco APIC Management Access Policy via CLI?

In APIC, the status (enabled/disabled) of HTTP, HTTPS, SSH, and Telnet state can be viewed in the following path: APIC > Fabric > Fabric Policies > Pod Policies > Policies > Management ...
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Lubuntu 18.04 can't SSH to Cisco Router: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1 [closed]

I'm not sure if this problem caused by Lubuntu or Cisco Router side. Lubuntu = 192.168.1.100 Cisco Router = 192.168.1.1 Ubuntu 18.04.4 LTS user@linux:~$ lsb_release -a No LSB modules are available. ...
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Python netmiko interactive session on Cisco IOS [closed]

This is simple Python code to get show hostname output in Cisco IOS. script.py from netmiko import ConnectHandler cisco_881 = { 'device_type': 'cisco_ios', 'host': 'host', 'username': ...
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Cisco Connect, Fiddler and Iphone Issue [closed]

I have Windows 10 where I installed Fiddler to capture the mobile traffic. I easily get mobile traffic by following this instruction at https://docs.telerik.com/fiddler/Configure-Fiddler/Tasks/...
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Cisco SPA3xx/5xx microphone input loopback

Not entirely sure where to place this question. But since this StackExchange branch is pretty much the only with questions regarding Cisco IP phones, I might give it a try here. Feel free to suggest ...
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1answer
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ipv6: I can ping only 1 interface within same network even with static route

This is how I set up a static route. R1(conf): ipv6 route 2004:DB8:2233:23::/64 2001:DB8:1122:12::2 With this, I can ping to 2004:DB8:2233:23::2 (S2/2 on R2) but not to 2004:DB8:2233:23::3 (S2/2 on ...
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1answer
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I Cannot Ping Switch to Device, but can ping Device to Device

I'm currently troubleshooting a network i built and I'm having an issue with ping connectivity, i have set up DHCP and DNS and my end devices can get IP's from DHCP as well as i have intervlan ...
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1answer
21 views

Cisco APIC `show version` formatting

Whenever I issue show version command in Cisco APIC, I'm getting weird output like this. Not sure why the hostname of controller AB_CDE_FGH_IJ_ACI_APC-0001 is separated into 2 lines which make the ...
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32 views

Correctly Setting up DHCP for Intervlan Routing

I am currently building a network and would like my two switches connected to my router to automatically assign ip addresses through DHCP pools to my PC's and devices. I have 4 separate VLans being ...
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1answer
74 views

Latency of 10G fiber SFP+

I'm optimizing network stack for latency. We were using SFP+ with fiber than we came to know that Direct Attach Cables (DAC) have lower latency as there is no SFP involve Link. We are measuring wire ...
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1answer
16 views

Cisco APIC node BGP info via CLI/SSH

Here is how to get BGP info in a host in Cisco APIC via GUI/HTTPS. APIC > Fabric > Inventory > POD 1 > (any) Host > Protocol > BGP This image is taken from http://cdn.techgenix.com/...
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47 views

Cisco ACI “show switch” reformat output nicely in 1 line

This is sample output of show switch command in Cisco ACI. If you see the last column Name, part of the hostname is moved to the next line and this makes the output looks weird. *Please take note ...
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1answer
36 views

Cisco ACI to SSH into multiple devices and run specific command

I need to get SSH banner from bunch of nodes from Cisco ACI. Let's name it as ABC-ACI-APC-01 configured with IP Address 10.1.1.1. Let say there are 50 IP Addresses available in this ACI started from ...
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19 views

What is “/mgmt/usr/bin/loginshell” in Cisco ACI?

I notice that Cisco ACI is actually running on some kind of Linux system? ABC-ACI-APC-01# echo $SHELL /mgmt/usr/bin/loginshell ABC-ACI-APC-01# What kind of shell is this? /mgmt/usr/bin/loginshell ...
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19 views

How to find minimum of hosts bits needed and assign equally to five subnets? [duplicate]

I have a 192.168.1.0/18 network block. How do I determine the minimum number of host bits to be borrowed and assigned equally to five subnets? How to calculate the number of users that can be ...
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1answer
36 views

QoS policy definition - Cisco guidelines vs reality

Currently designing a QoS Policy for a customer (Cat 4500 models), following the business needs, I will work on a 8-class based model definition. Cisco has several guidelines under this perspective, ...
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1answer
58 views

No DHCP ACK from Cisco 897

I have a Cisco 897 acting as the DHCP server for a LAN. The problem is that no client is receiving a DHCP ACK. Client sends DHCP discover Cisco responds with DHCP offer (with IP address) Client ...
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1answer
43 views

Is it possible to determine the origin of a BGP withdraw message?

is it possible for an ASN in the BGP path to determine what ASN has been the originator and the cause of withdraw message?
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1answer
28 views

Firmware of Cisco Phone

i want to configure IP phone Cisco DX650 with Sip.Anyone have idea about it how i can upload firmware of sip feature
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1answer
52 views

How do I split static IPs from an ISP for separate usage?

I have a lot of IT experience/consulting, but want to test what I have done against some of the real experts hre in the networking field so I can keep learning and do what's best. I have ISPs with 5 ...
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1answer
41 views

Is there a problem with “max age” definition in STP?

In "CCNP and CCIE Enterprise Core ENCOR 350-401 Official Cert Guide" we have this definition of max age: Max age: This is the maximum length of time that passes before a bridge port saves its BPDU ...
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2answers
24 views

Multiple SNMP servers on single agent

I am trying to test a new SNMP server (Nagios Core) along side the current one (Check MK) which has already been running for quite some time now. Will this cause any problems on an agent device (Cisco ...
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Cisco IE2000 - NTP Doesn't Associate

I'm having a very weird issue with a switch. It doesn't want to associate to my NTP servers. My config is very simple: ntp server ntp1.domain.com ntp server ntp2.domain.com ntp server ntp3.domain....
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27 views

sfp-25g-sr-s alternatives

I work at a media company and we have a room where we're essentially having a spine leaf topology implemented for our network. Now there's 4 spine switches and 6 leaf switches, the sfp we're using are ...
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13 views

What's the difference between “IP NAT Inside Source” and “IP NAT Inside Destination” commands in Cisco routers? [duplicate]

As much as i know both of this commands translate source address of packets that travel from inside to outside and destination address of packets that travel from outside to inside,so what's the ...
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2answers
39 views

OSPF interfaces

Is it possible to use two ospf interfaces connected from Core switch to the Distribution switch each one has a different subset?
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1answer
51 views

Link Aggregation from Cisco to Palo Alto using 10 gig interfaces, port on Cisco shows “waiting to be aggregated”

I am trying to bundle two 10-Gig interfaces on PA-3020 to Cisco Cat9300. Previously, I had bundled two Gigabit interfaces on same devices and everything worked fine. But now, when I try to configure ...
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1answer
28 views

Cisco snmp-server single user for multiple snmp versions

Attempting to maintain SNMP v2c compatibility while implementing SNMP v3 on cisco switch 5506cx. Would a user that was previously used for v2c see issues with v2c if it is added to a v3 group? For ...
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1answer
24 views

track command not found on switch Catalyst 2960-X Series

I have a problem with the command "track". I have done this command multiple times on other router and I believe my command is correct. However when I wanted to do this on a switch it shows "Invalid ...
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0answers
24 views

Cisco AIR-AP1852i-E-K9 stuck in “waiting for uplink[…]” after startup

I pulled an old cisco AP from a shelf today at work to test something, and after starting up and connecting with PUTTy, i was greeted with (after startup), this - repeating over and over: [*02/16/...
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0answers
47 views

802.1Q Tag mapping using Private VLANs on Cisco Nexus 3524

I'm struggeling with a VLAN mapping issue on a Nexus 3524 Switch. My setup: Downlink router<---Dot1Q 1901--->NX3524<---Dot1Q 493--->Uplink router I already figured out that basic 1:1 ...
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0answers
9 views

Can't Turn off Flowcontrol 4331 NIM-ES2-4

I think Flowcontrol is causing errors on some specialized tests that I'm doing. I can't turn off Flowcontrol on the NIM-ES2-4 port. tried 'flowcontrol rec off' and setting speed auto... flowcontrol ...
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0answers
19 views

Trying to establish stable connection, ping drops intermittent in PACKET TRACER

This was given by my friend and i cannot touch any of the configuration of the ISP router in the middle. but i have screenshots of routing table and interfaces. pinging the middle router from HOST A ...
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3answers
132 views

Cisco 2960 Spantree Rootchange every few minutes

There is a wireless Ubiquity bridge set up between our main building and this switch in a building across the street. The Ubiquity connection never appears to have any issues, it's just the cisco. ...
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0answers
53 views

In a Cisco iOS container, how do I do a cronjob?

I have a Cisco LoRaWAN gateway. The packet forwarder runs in LXC container but is missing a couple of features I am used to from Linux. Currently I am able to adjust some crontab features with ...
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1answer
56 views

Cisco 3850: Process responsible for Softbuffers

There is a command to increase the SoftMax Buffers on 3850 switches: qos queue-softmax-multiplier 200 This is done in percent which means i am doubling the amount of softmax buffer. Before, the ...
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1answer
44 views

OSPF neighbor not working

I'm currently designing a spine leaf network, 2 Spine switches and 4 leaf switches. btw this in packet tracer. So in order its Spine1# and Spine2#, then Leaf1#, Leaf2#, Leaf3#, Leaf4#, and addresses ...
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1answer
55 views

Why got no response from xx.xx.xx.xx when adding @vlan to snmp command?

I want to retrieve host's mac addressed which connected to cisco switch. And I see a lot of people say that "snmpbulkwalk -v2c -cpublic@vlan hostname BRIDGE-MIB::dot1dTpFdbTable" can get the host's ...
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1answer
53 views

Why are subnetting exercises done by manipulating numbers at the binary level?

I always had this question. You can see that even cisco does that. Why not use a tree-like structure? Like so: Another example: http://www.davidc.net/sites/default/subnets/subnets.html Of course it ...
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1answer
62 views

Why can't get host's mac address on l2 switch through snmp? But can get it on l3 router

I am trying to get computer's mac address through snmp. I have an envirmont in GNS3: l3 R1's image is vios-adventerprisek9-m.SPA.157-3.M3 l2 SW1's image is viosl2-adventerprisek9-m.SSA....
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0answers
26 views

How can I configure a Cisco router 4300 to allow internal server ip:80 to be accessed on public ip:4500

I have an internal web server on port 80. I need help commands maybe to configure port forwarding to access the server on my private network from a public IP Current running config interface ...

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