Questions tagged [cisco]

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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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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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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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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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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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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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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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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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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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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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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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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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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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Cisco replacement - configuration compatibility

We have several Cisco Switch (3650), these switch are End Of Life and we want to replace them. A vendor propose us to replace them by Cisco 9300. Will we be able to just upload the configuration of ...
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using Cisco WIC-4ESW 4PORT ETHERNET WIC Card (L2 switching card) on a 1700 Cisco router, where the router stores the MAC address of connected devices?

Router is an L3 device, but some models (such as Cisco 1700 router), we can attach the WIC-4ESW which is L2 switching card. as per the offical Cisco datasheet: The WIC-4ESW interface card is a Layer 2 ...
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VRF Leak global default route with a single router

I am fairly inexperienced with VRF, and I'm struggling to leak a default route from the global table, into the VRF. I've come across various solutions, but none seem to properly fit my requirements, ...
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Which route does a cisco router prefer and why? [duplicate]

I have a small network i packet tracer whith some subnets. I connected the subnets with static routes. In one case I made two routes two the same subnets, but one is a serial connection. I wonder ...
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7 votes
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Will a 3rd party SFP module void Cisco warranty?

Will using a non-Cisco branded SFP module void any warranty with Cisco (either with the switch or network module)? The SFP we are looking for more cost effective alternatives is SFP-10G-SR-S in a ...
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2 votes
1 answer
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Using PT and EtherChannels along with STP

I'm very new to all of this but I am trying to create a network topology as practice that uses three etherchannels across three switches and then rely on STP to block one. So far it was working well. ...
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Connect a router to multiple router/subnet - Cisco Packet Tracer

I'm studying DNS Server. So I try this. Here is the flow when I request abc.com webpage from My PC. My PC (192.0.1.2) send DNS query to Router0. Router0 then forwarding to DNS Nameserver (10.0.0.2). ...
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How to view or change OSPF LSA max-age time in Cisco IOS?

Is there any way of viewing or changing OSPF LSA Max-Age time in Cisco IOS?
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How to export a device configuaration in Gns3

I have A Gns3 topology and i try to save my configurations to a txt file in my desktop. I tried the [Tools] > [Import/Export node config] in the menu,[Export configs to a directory] but it only ...
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TRex Warning : number of rx packets exceeds 101% of tx packets!

+------------+ | | +------------| tester |<-------------+ | | | | | ...
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Cisco Packet Tracer gives "Invalid IP Address" when I assign an address to a router [duplicate]

I was given an exercise where I have an IP address range and I have to configure multiple sub networks from that range. The address is 238.61.192.128 with the mask 255.255.255.128 (/25). I created my ...
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Cisco L2TP VPNd with GRE over IPsec tunnel [closed]

I have a GRE over IPsec tunnel between router 1 and router 2. The routing between the 2 routers is EIGRP. I have access to the CLI and I can ping all subnets. I try to create VPNd L2TP I create it, ...
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3 votes
1 answer
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EtherChannel ports standalone after restarting packet tracer

I got two L3 switches (Cisco 3560) with no switcport ports connected to L2 switch (Cisco 2960). It used to work, but when I saved and restarted Packet Tracer -- all ports went into standalone mode. ...
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5 votes
2 answers
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STP convergence process needs detailed explanation, please

So, I understand how STP convergence works on high-level. However, when I am trying to look into the process deeper, I run across some doubts I would appreciate someone could clarify to me. Here we go:...
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2 votes
1 answer
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HSRP switching active state but destination is unreachable

I've been working on a this network where I have 2 routers, Main router and failover router. both routers are connected to the main switch via fa0/0 which is divided into 3 sub interfaces, fa0/0.10, ...
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2 votes
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Cisco C9300 Drop Out And VLAN Table Loss

I have a Cisco C9300 is one of my main racks. Recently it has been restarting on it's own. My suspicion that the PSU is on the way out. Strange part is when it does this the VLAN table resets to ...
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4 votes
2 answers
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Passive interface default - issue

I was trying to configure ospf router, I have a router connected to FW in G1/0/10 and mpls router connected g1/0/1, when i typed passive interface default in the ospf router i lost all connectivity ...
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Switch Port channel down but firewall did not log the port down event

Can some one help me here if I am missing anything to check. Issue: Our Palo Firewall got a vwire configured with interfaces eth1/5 & eth1/6. eth1/5 is directly connected to eth1/2 of cisco switch ...
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5 votes
1 answer
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Cisco 9300 Software upgrade without automatic reload

Is there a way to upgrade a Cisco Catalyst 9300 switch to a new software version without the switch automatically reloading as part of the initial install process? With other switches (eg Cisco ...
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1 vote
1 answer
239 views

Cisco Packer Tracer port labels all jumbled and covering each other

Has anyone found a solution to make this look cleaner and more readable. I spend hours moving around the devices trying to figure out which interface is connected to which router and make so many ...
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Nexus Management VRF on same VLAN as LAN switches

1 Hi All. I searched this question but I'm not finding anything relevant, or I'm not understanding the results properly. I have all my L2 switches remote management access, SSH/SFTP, configured on a ...
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2 votes
0 answers
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Problem with bgp aggregate-address behavior in iOS when a large number of OSPF routes update all at once

We have a direct connect setup to AWS using BGP. We are running a ISR4451 with IOS XE 16.03.06. I have a strange situation where the AWS BGP neighbor drops our connection with the notification: ...
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2 votes
1 answer
108 views

AAA Authorization on IOS

Still working away on a project (not for real life deployment so don't worry about seeing passwords). I have a Tacacs server set up for centralised AAA. I am trying to set up two users, "admin&...
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Access TACACS+ Server through ASA

I am trying to set up TACACS+ for a project. The below image shows the layout of the network. So far I have the TACACS+ server set up and working (HQ_AAA_SERVER) and it works fine for authentication ...
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Cisco 2960 and Cisco 871 - no connectivity on non-default vlans

Unable to get internet connectivity from non-default vlans. Suspect router config is not adequate Five vlans created on 2960 (10,20,30,40,50)and Gig port 0/1 set to trunk. Port f0 on router which is ...
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0 votes
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Active Peer [my FTD IP] already exists

I have configured the Cisco FTD and FMC, now I am trying to add the FTD Device to FMC but the system shows me such an error. Active Peer [my FTD IP] already exists and the the FTD Device doesn't ...
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2 votes
1 answer
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Cisco ASA Clientless SSL VPN Apply Tunnel Group

I'm trying to implement the answer from a previous question I've asked (Cisco ASA Clientless SSL VPN Restrict Network Access) My ultimate aim is to set up an SSL VPN on a Cisco ASA device to allow ...
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How many queues are available for fair-queueing on ISR1k

I am working on a QoS configuration on a Cisco ISR1000 device with Firmware Version IOS-XE 16.12.04. I enabled fair-queueing on an interface and the command to set the number of queues is not ...
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How can I do ERSPAN on Cisco Nexus 9000 for VLAN serment?

I need to capture traffic in local VLAN on Nexus9000K, start wireshark on my laptop, ip address of this laptoop is 9.9.9.9. Also I want to capture only icmp and src host 10.0.0.0/24. I try to do this: ...
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1 vote
1 answer
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Cisco ASA Clientless SSL VPN Restrict Network Access

I'm working on a Uni project to set up a secure network. One aspect is to have a VPN for clients of the imaginary company to access web based services. I have set up a simple clientless SSL VPN which ...
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9 votes
5 answers
852 views

Different Behaviour of a Router

There are 2 cases that I would like to point out: When the router is directly connected with 2 PCs like this, In this case, PC2 is able to ping PC3. I just configured the IP address of PC2 and PC3 ...
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1 answer
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Is this network configuration possible with Layer 3 switch and ISP routers?

If possible I would like to use a Cisco SF350-24 Layer 3 switch to enable the below network layout. In our office we have 2 internet connections we often use for testing that require an internet ...
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3 votes
1 answer
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HSRP on multilayer switch not working

I have this network topology in Packet Tracer, and i wanted to implement HSRP on both of the multilayer switches. So what i made here is the switch on the left, both the laptop and the server are on ...
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-1 votes
1 answer
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SFP not working on new switch

Switch: Cisco 2960G 24x 1G ports and 4x 10G SFP SFP fiber module: 10Gtek AXS13-192-10 NIC: Solarflare SFN7122F I got a new to me switch, after resetting to factory defaults I got it all configured for ...
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1 vote
1 answer
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Cisco SD-WAN Cloud OnRamp Configuration

I'm configuring a user per the instructions https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/cloudonramp/ios-xe-17/cloud-onramp-book-xe/cloud-onramp-multi-cloud.html#...
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1 vote
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Using PBR or similar for an IP SLA for a C1111-8P-TLELA with a dynamic Cellular WAN IP

I am trying to get 4G Failover working on a Cisco C1111-8P-LTELA router. I have a known working solution that I usually use with IP SLA, and a local PBR route-map that forces traffic out of the ...
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