Questions tagged [cisco]

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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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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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50 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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130 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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48 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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36 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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83 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
49 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
25 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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16 views

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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31 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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43 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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183 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
30 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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26 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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153 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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76 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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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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22 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
214 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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57 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
128 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
63 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
65 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
54 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
71 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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34 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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1answer
31 views

ASA shows Action:Drop on packet-tracer, no reason or phase

I am doing a very simple lab with one asa and two computers. PC1 connected to dms PC2 connected to outside : Hardware: ASA5506, 4096 MB RAM, CPU Atom C2000 series 1250 MHz, 1 CPU (4 cores) : ASA ...
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60 views

Cannot create connection between two routers in same VLAN via switch

I currently have a Cisco 2960-24TT switch (switch1) and a Cisco 1841 router (router1) that form part of my core network connecting other VLANs and devices. The two ports on router1 have been ...
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77 views

NAT overload and access to web resources

I have really bizarre problem in clients network. Clients have access to the internet via NAPT - I'm using several public ip addreses for this purpose. (I'll change ip addresses for obv reasons) ip ...
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1answer
45 views

RV320 router between 2 access points and secondary VLAN [closed]

I have a Cisco RV320 that is sitting between 2 different routers/access points on my network. Essentially: My ISP's router/access point <-----> RV320 <-----> My other access point My ...
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1answer
40 views

Is it possible to upgrade a cisco 2600 series router to gigabit?

I'm new to working with networks and I have two cisco 2600 series routers (specifically 2610xm) which both have Fast Ethernet ports. I have configured these and been learning how to work with them ...
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1answer
47 views

No console connection possible to Aironet 2600 series

I've got my hands on a used Cisco AIR-CAP2602I-E-K9 and seem unable to connect to it via the console. It's connected to my COM3 port and the status LED is constantly blinking green. I've tried all ...
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51 views

Cisco Prime: Accurate Wi-Fi association history?

I'm running Prime 3.7 with a 2504 WLC (8.5.151.0) and am finding that the client association history under Monitor -> Clients and Users -> [select a client] does not show associations that last less ...
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1answer
185 views

Traffic redirection and failover of ASA with multiple ISPs [closed]

I have two ISP connections on two Cisco 3900 routers, in front of Cisco asa 5525 x with firepower services firewall. I want to configure the firewall to redirect traffic based on the source address ...
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1answer
44 views

What happens if I press the Button in a Stack Setup on a 2960-X?

Someone recently push the Mode button for too long and the Switch Stack restarted in Express Setup. Is this the normal behavior on the Mode Button? Where were debating that the Whole Stack was not ...
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43 views

Is there a way to check which routes are matched by a term in a routing map?

I have created a prefix-list and I am using it in a route-map. However, my route-map is not working as I expect it to work. ip prefix-list LIST_A seq 5 permit 10.20.20.0/22 ge 32 route-map A-B-OUT ...
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1answer
41 views

Using a VLAN to Completely Isolate Devices from the Internet & Other VLANs

I have a Cisco SG350-10P Managed Switch, and currently have two VLANS on it, the default VLAN 1 and VLAN 10. I want devices connected to VLAN 10 to have no ability to communicate with the internet or ...
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1answer
195 views

Lightweight AP won't join with Wireless Lan Controller

I'm trying to set up a wireless network, and learn at the same time. I'm using a Cisco 5508 WLC and a AIR-CAP3702I-A-K9 lightweight AP. The problem I'm having is that the LAP won't joing with the WLC. ...
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107 views

Nexus OS IP SLA Object tracking

I have not configured IP SLA object tracking on nexus OS before and its looks a bit confusing. Can someone help me interpret the following configuration? This example shows that object tracking is ...
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1answer
91 views

Cisco ASA5585-X replace SSP-20 with SSP-60

We have cisco ASA5585-X with SSP-20 running in production and we need more power so planning to replace SSP-20 with SSP-60 module but not sure we can just hot swap with SSP-20? Does ASA5585-X support ...
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1answer
90 views

Unable to ping between router and routed port on L3 switch. Why?

I've got an old Cisco 2811 connected to an old Cisco 4948 L3 Switch. I'm trying to teach myself a little more about L3 Switch implementation. All I'm trying to do at this point is get the router and ...
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1answer
43 views

Can the regulatory domain be configured on Cisco WAP571 devices?

I got 3 WAP571 and 2 WAP571E (outdoor AP). According to specs, all 5 AP's should work in a Single Point Management and allow seamless roaming. Yet, the two types of AP's do not speak to each other. My ...
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1answer
28 views

How to use VIRL Connect Tool

I have just installed VIRL 1.6 today. I am a first time user. Can someone please tell me how to have granular control over the connect tool. I am trying to create a simple lab and when I try to create ...
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1answer
42 views

Site to Site VPN between Cisco C800 and Sonicwall

I would like to have Tunnel based (route based) vpn between Sonicwall with Public IP 1.2.3.4 and cisco c800 with dynamic IP. In case of dynamic VPN, i learnt that vpn mode would be aggressive mode ...
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1answer
138 views

ISR4000 ignoring boot system comand

i have an issue with an ISR4331 Box. My aim is to install IOS 16.09.04 on the box currently running at 155-3.S4b. #sh run | sec boot boot-start-marker boot system flash bootflash:/isr4300-universalk9....
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1answer
153 views

Is it possible Running all Cisco IOS images inside gns3?

I have recently installed gns3 and I have specific ios version which I need to deploy locally for training, but for some reason gns3 wont pick them up. I am wondering is there any workaround for this? ...
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10 views

Ipv6 link-local/multicast issue [duplicate]

When you ping a link-local address why is the destination (in packet tracer) to the solicited-node multicast address of the host and not the (FE80) link local address ? I understand that it needs to ...
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2answers
61 views

Cisco Switch without VLAN support?

I've been reading about VLAN and wondering is there any Cisco Switches that do not support VLAN? So far, all switches that I found do support VLAN. This is one of the example in my lab. Cisco-Switch-...

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