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Questions tagged [cisco]

The major provider of networking equipment. This is a generic tag to be used when no more specific tags are available. See the list of tags in Help Center Tag page.

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Stackpower - hot pluggable?

I need to add a C3850 switch to an existing switch stack. I know I can unplug a stackwise cable from the stack without problems, but is it the same with stackpower cables ? All switches have at least ...
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Connecting 9 Remote Sites with VPN Tunnels

I am working in a Cisco ecosystem and need to be able to test a 9 tunnel IPSec network over the internet using 10 x Cisco 1941 routers. This is a "hub and spoke" type configuration; where ...
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1 answer
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Dell OS10 equivalent of Cisco switchport access

hoping someone knows OS10 command structure :) In the Cisco world, if I want to create an access port and add it to VLAN 50 its simply: switchport mode access switchport access vlan 50 What would the ...
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What is the ssd LUKS file on the (boot)flash of newer 9k Catalyst switches?

On a couple of our recent Catalyst 9k switches running IOSXE 17.3.x we've noticed a file with the name 'ssd' on the (boot)flash: filesystem. switch#dir flash: Directory of flash:/ 270353 -rw- ...
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1 answer
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Command for interface uptime

Is there any command to find out how long a particular interface has been up on a cisco switch ?
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1 answer
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How can i create this topology in cisco packet tracer?

How can i create this topology in cisco packet tracer? wiil be it look like this?
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how to limit or block broadcast traffic on ASR920 service instance EVC

I don't want to turn off all port, I want to block completly broadcast traffic, or the best to limit rate to 500 pps broadcast, all more to drop. Is there any way to do it on Cisco ASR920? I have ...
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3 votes
1 answer
44 views

Two multicasts from same source not reaching a destination

I have a single multicast source (Server A) sending to destinations 239.0.0.226 and 239.0.0.227, the source being directly connected to Switch A on VLAN 100. Switch A is sending dozens of multicasts ...
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7 votes
3 answers
658 views

Can I announce the same block of /24 given to me by ARIN at two different locations?

The setting: Two locations I'm trying to connect. I have a /24 address block from ARIN Both location have the Same ISP. The Question: Can I announce the same /24 address block at the HQ location to ...
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Access point 9130AX Vs 9120

I reviewed both access points datasheet 9120 and 9130 I found out both have same coverage and the only one different that I noticed is 9130 has the 4x4 2.4GHz and 4x4 5GHz which it's dual mode 8x8GHz, ...
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1 vote
1 answer
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show ip ospf neighbor unexpected results On packet Tracer

I made a small separated networks on packet tracer and used OSPF protocol to route between networks. Although The connect is Successful when I write 'show ip ospf neighbor' Command in CLI router X ...
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2 votes
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Cisco Access Switches: Monitoring AAA server dead via SNMP?

This is a new setup of Cisco access switches (2960S, 2960X IOS with 15.2(2)E9, but mostly C1000 with IOS 15.2(7)E*), with a Cisco ISE 3.0 as authentication server for 802.1X, config style is to be ...
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1 vote
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MAC address table and frame forwarding on Layer 2 switches - question about when two computers are connected via hub to same switch port

My apologies if this is not the right forum to ask this, but I am a newbie when it comes to networking. I am currently going through the CISCO Networking Essentials course, and one of the Activities ...
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-1 votes
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oversubscription ratio network design [duplicate]

Can some one explain with an example what exactly is oversubscription ratio in networking? Where is it used? How do we calculate this value? Could you please provide any detailed example to explain.
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2 answers
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How to configure a layer-3 switch for routing between VLANs?

I have set up the router as a dhcp server and I would like to use the layer 3 switch to route each PC in seperate vlans. How do I configure the router and L3 switch for inter vlan routing ? the router ...
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2 votes
2 answers
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How to configure a router as a dhcp server for vlans through a Layer 3 switch?

I would like to know what commands to type in the different switches and the router to to make the router function as a dhcp server for each PC in seperate vlans . I know to create the dhcp pools in ...
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Cisco EFP point-to-point -- How to see MAC addresses

I see on cisco ME3600x and I read in documentation as below, that "the MAC learning is not supported in point–to–point bridge domains" Table 1 MAC Learning Actions Scenario Action A bridge ...
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Cisco BGP Configuration

I need to configure a Cisco C1113 (router B) to enable BGP Routing between two networks. I configured my router B, but I would need to make sure that my configuration is correct... Here is the ...
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1 vote
1 answer
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Need help with create Vlan for radios

I got a ticket that need me to create VLAN 1080 IP 10.1.108.0/30 this Vlan is only for the two radios that will connect between two building A and B hostname BUILDING-A-IDF-01 ! switch 1 provision ...
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4 votes
1 answer
277 views

How can I upgrade Cisco Nexus switch if not enough space for new image?

I have Nexus 92348GC-X units with 9.3.7 image version and I need to upgrade them, BUT not enoght space on this devices for new image upload (nxos 9.3.9) Moreover, I can't delete old image after I ...
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SNMP errindex is set while using rttMon on asr900rsp3

SmokePing can't create an rrtMon task on a asr900rsp3 router. While using debug snmp on the router I got the log below Apr 12 05:02:30.908 UTC: SNMP: Response, reqid 1608294255, errstat 10, erridx 5 ...
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1 answer
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ws-c3750x-48pf-s v02 not booting after password reset procedure

I tried to do a Password Reset Procedure on ws-c3750x-48pf-s v02 - 48-Port PoE, but at the end of the procedure the switch no longer works after multiple restarts and pressing the mode key, I always ...
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0 votes
1 answer
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HP 6120XG switch LACP is blocked - error condition

Folks, I am dealing with very strange issue related LACP and not sure if its bug of 6120XG switch or something else. so let me explain my issue here. Network Diagram: I have two Cisco Nexus 9396PX ...
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4 votes
1 answer
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How Can a VPC ping the Router through an Etherswitch that behaves in one port as router and in the other as switch

In the following topology my main purpose is to: 1)PC11 ping Router(R) 2)PC11 ping PC13 ESW10: In gig0/3 has the no switchport command and a given IP address. In gig0/2 it has the switchport access ...
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2 votes
3 answers
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CCNA | OSPF | What differences can exist between two processes of a single routing protocol?

It is my understanding that a process is a specific-instance of a routing protocol. The process-id is a symbolic representation of a unique instance of that RP within a router. If that's the case, ...
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2 votes
1 answer
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Multi-Home BGP on ASA 5500

We have an ASA that has been doing iBGP for hosted networks. These networks include public address spaces that are routed inside our networks. Recently we have changed providers. The new provider does ...
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2 votes
2 answers
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Can Loopback IP be Public

I have a Usecase where an Access Device need to reach a Core Device over the Internet. Access Device is configured with the Public IP of the Core device as of now so that it can reach the Core over ...
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1 vote
1 answer
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Cisco ISR 4000 series with SM-X Layer 2/3 module

I have a Cisco SM-X-16G4M2X Layer 2/3 Service Module installed in an ISR 4000 series router, and I would like to configure its ports as level 2 in a vlan, and then configure that vlan with an IP ...
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0 votes
1 answer
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Why can't I ping from a pc in one OSPF area to a pc in another OSPF area after configuring each neighbouring network?

So I have an exercise with this topology: I have configured all the OSPF networks on each router and I made every g0/0 interface (except for the ABR in the middle) a passive interface. However, I ...
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3 votes
1 answer
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How do I check if a Cisco switch is connected to a SYSLOG server?

We use the Cisco C2960X switch. Query 1: What does console, monitor, buffer & exception logging mean? Query 2: Capture logging to 192.168.X.X which means if the switch sends logs to the SYSLOG ...
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2 answers
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Question about subinterface DHCP relay CISCO

I want to make 4 PC got DHCP IP address No problem with left side, but right side 2 PC can't get IP automaitic. I think the problem is DHCP Relay. How can I use ip helper-address for subinterface of ...
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Can we still upgrade the firmware version of a 2900 router?

current version: Version 15.7(3)M5, RELEASE SOFTWARE (fc1) seems i can't find any of the upgrades on the internet.
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1 vote
0 answers
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How do I set up IPv6 multicast over an MPLS carrier?

I'm setting up an MPLS carrier with VPNs in GNS3, using Cisco 7200 routers. Exact version I'm using is C7200-ADVIPSERVICESK9-M Version 15.2(4)S5, but I'm willing to upgrade/change if that's needed. On ...
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1 answer
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Cisco ASR 1001 transceivers not working

I've a Cisco ASR 1001 v03. When it got to my hands it wouldn't save the config after reboots, after some research I found out the config-register had a wrong value and it was fixed by running ...
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1 answer
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Why does redistributing ospf in rip change the path of all routers on the rip network that are not directly connected to the router that redistributed

I have three routers connected to each other. Each has a subnet that it uses (eigrp, ospf, rip) as shown in the figure I managed to redistribute EIGRP and OSPF, this works perfect. But when I try to ...
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0 votes
2 answers
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Why is a switch port a collision domain?

I'm just starting my IT education and this is probably a very basic question but I'm having trouble with it. As far as I understand a collision domain is a part of a network where collisions can occur....
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How do I decide which router should be DTE and DCE? [duplicate]

When connecting two routers with a serial cable one end of the cable is always DTE and the other is DCE. How do I decide which end I should connect to which router? Does it even matter? The worksheet ...
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1 vote
1 answer
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Trunk seems to be allowing all vlans

Got a catalyst 2690 on a small office net consisiting of 2 vlans, 10 and 20, 10 for the lan and corporate wifi and 20 fot guests wifi. All lan ports are config on access mode vlan 10 The access point ...
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1 vote
1 answer
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What are the commands to configure static routes using next-hop IP addresses?

Given the network topology above and that X in all subnets should be replaced with 1. What are the commands to configure static routes using the next-hop IP addresses on r1 and r2, given that you are ...
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2 votes
0 answers
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Cisco ISR cannot ping from WAN but internet works

Cisco ISR 4331 works but ping/ssh/web outside/GRE doesn`t I have changed an old router to Cisco ISR4331. Have set up everything, nothing fancy, no VLANs/OSPF/redundancy, etc. Just a gateway for an ...
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3 votes
1 answer
41 views

Cisco 9400-Supervisor Engine 1XL uplink help

I have inherited a Cisco 9400 with 6 line cards installed. I am trying to use some ports on one of the cards. I noticed that there is no link activity lights, no indication of any activity. I think ...
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2 votes
0 answers
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Cisco ASR9K Bridge Domain Loop

If multiples interfaces on a Cisco ASR 9K bridge domain are going to the same broadcast domain, can a loop occur ? Something like this : bridge-domain VLANX interface TenGigE0/0/0/0.X --> To ...
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1 vote
1 answer
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Can I use a 40G transceiver in a QSFP56 NIC to connect to a 10G transceiver/switch if the NIC supports 10G speeds?

We're purchasing new servers that have Mellanox ConnectX 6 network cards in them, which accept QSFP56 transceivers. The card says it supports 10/25/40/50/100/200G. However, our switching backbone is ...
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0 votes
1 answer
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exchange routes and prefixes of remote clients in the mpls

is it possible to exchange routes and prefixes of remote clients in the mpls by an ospf? to avoid creating each time BGP sessions between PEs especially when the topology is scalable
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1 answer
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How can I exactly find out what outgoing interface is using?

I need to identify what outgoing interface is using for some destination address. show ip route tells me several BGP routes to this destination, how can I exactly find out what switch's interface will ...
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0 votes
1 answer
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How to link three Cisco 2960 switches together?

Current Network Setup I have three Cisco 2960 switches. Each switch linked to a lab of 12 windows 10 computers. All three switches are in the same cabinet. 1st switch connected to 2nd switch using the ...
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2 votes
1 answer
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Scan sg350-28 with Nessus Credentialed checks

We recently bought the sg350-28 28 port Gigabit Managed Switch I need be able to run Credentialed nessus scans on these devices SSH is enabled I can SSH from putty I can SSH from the sever where ...
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0 votes
1 answer
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Cisco Switch SG220-50: Invalid port id

I have cisco SG220 series switches with 50 Port available for use before unknown incident happened. After the unknown incident happened 24 port consist of Gi1 - Gi12 and Gi25 - Gi36 can't be used. ...
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Does vIPtela vEdge router (Cisco ISR1100) support OSPF Link Local Sharing (OSPF LLS)?

I am using Cisco ISR1100. This is the system information in detail. Viptela (tm) vedge Operating System Software Copyright (c) 2013-2022 by Viptela, Inc. Controller Compatibility: Version: 19.2.3 ...
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1 vote
1 answer
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Cisco 4500X TCAM question on PBR

I have a pair of 4500x in VSS mode and i have 100-150x SVIs and i have PBR under those SVIs and i am changing their next-hop, i want to know PBR and changing next-hop happens in TCAM, hardware or it ...
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