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Questions tagged [cisco]

Cisco is a provider of switches and routers to commercial consumers. Cisco devices run IOS or NX-OS operating systems. This is a generic tag to be used when no more specific tags are available. See the partial list of tags in the full Tag Wiki.

Cisco is a provider of switches and routers to many medium and large companies. Cisco devices often run IOS or NX-OS operating systems.

Since Cisco acquisition of Linksys, the consumer line of switches, firewalls and routers (which do NOT run IOS) have been rebranded under the Cisco name.

This tag is a generic tag - Wherever possible a more specific tag related to the product you are using should be used instead. For example:

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Does OSPF routing protocol works in AWS?

I'm having troubles with finding the neighbors after the IPIP tunnels configurations where I have 4 VPCs and deployed there 4 CSR routers (for more details about the configuration, I posted yesterday in Network Engineering section OSPF over IPIP…
Khalil Mebarkia
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I lost ssh connection to my instance CSR 1000v AWS

I erased the configuration of my CSR 1000v bu using the CLI command wr erase and there reload. After that, I lost the SSH connection. I was not able to connect to the instance even though it has a public IP and DNS. It always asks me a password…
Khalil Mebarkia
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cisco 4948 IGMP flooding on all ports

everyone Having trouble with multicast on cisco WS-C4948-10GE (MPC8540). I have two switches running: System image file is "bootflash:cat4000-i5k91s-mz.122-25.EWA9.bin" and System image file is "bootflash:cat4500-entservicesk9-mz.122-46.SG.bin" Both…
Tomato
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How to create interfaces for CSR 1000v for GRE tunnels?

Well, my idea is to connect to 4 CSR 1000v routers in different VPC (without VPC peering). I've basically finished with everything with the pre-configuration creating VPCs, subnets IGW, modifying Route Tables ... etc. Then, using IPsec over GRE…
Khalil Mebarkia
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Can't find Cisco CSR1000v image for deploying in GCP

I would like to deploy Cisco CSR1000v on VM instance but I cannot find it among the OS images in GCP, neither custom images and marketplace. I'm following the tutorial below:…
Khalil Mebarkia
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How do I exclude return traffic from my ACL?

I have this network topology. What I try to achieve is: Deny access from Network 172.28.224.0 to Network 172.28.226.208. But the other way around it should work. 172.28.226.208 should be allowed to access 172.28.224.0 I have tried it with the…
Manu922222
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How can I disallow access to a specific ip within a LAN?

My Network topology looks like this: PC1------- PC2-------Switch--------Router-PT PC3-------2960-24 PC4------- What I try to accomplish is: No PC is allowed to ping PC3, but PC3 is allowed to ping every PC. Do you have any suggestions? Can I…
Manu922222
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Basic QoS bandwidth for all devices/clients

I have an IP network that has about 500+ clients on the network at any given time. The network uses a Cisco 1941 router as it's gateway, and has 5 different subnets. The network also has 2 DCs, a asterisk PBX server, and farm of 5 exchange servers.…
Kevin
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Azure VPN Site to Site VPN (Azure to Cisco)

I configured a VPN IP Sec tunnel from VPN gateway in Azure to Cisco Router to customer end. created vpn gateway created local gateway config and connected successfully to a cisco router at customer end stood up a VM and connected to a VNET that…
Marko J
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Can not create sub-interface in Cisco CGR 1240

I follow a tutorial, there shows the method of create sub-interface: but in my actual situation, I can not do this: Router(config)#interface gigabitEthernet 2/1.100 ^ % Invalid input detected at '^'…
244boy
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Traffic burst in cascading Cisco switch configuration

I'm using 2 Cisco Catalyst 3850 switches (Sw1, Sw2) and 3 Cisco Nexus switches (Sw3, Sw4, Sw5) as part of my internal network, connected in the manner below (A, B, C, D, E, F represent 10G ports, i.e. A on Sw1 is connected to A on Sw3). The switches…
Rayne
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OSPF - default-information originate : multiple routers

I receive a default route via iBGP from R1. On both R2 and R3 I have default-information originate configured. On R4 I only see one default route in the OSPF database; either to R2 or R3. When I shutdown one of the links from R2 / R3 to R1, I see…
btk_
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Cisco AIR-CAP702W-K9 enable lan ports

The 702w's have four LAN ports which are disabled by default. I'm trying, on the autonomous image (15.3(3)JAB), to enable the ports. I've tried following the official guide from Cisco, but fail to enter configuration for the ap#config t Enter…
Changer098
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New computers can't connect to the network

Good Morning, We have a business environment in which we have 3 Cisco 3850 PoE stacked and We manage our DHCP through our DC server. Last weekend our UPS had a failure and switched off all outputs, so all the equipment has been reset since then. On…
Arheisel
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DHCP snooping - my clients dont get ip from dhcp

Why the PCs don't get ip from Core switch Dhcp pool? without dhcp snopping there is no problem, but when i enable dhcp snooping clients stoping to get ip from dhcp. This is my topology: topology Thanks. http://uupload.ir/files/fqsd_capture.png
user2649382
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