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.

Filter by
Sorted by
Tagged with
0
votes
2answers
216 views

Recommended switches and routers configurations for a building of 5 floors?

Just recently I had an interview for a network Engineer position. The interviewer asked me the following: You have a building of 5 floors, where each floor has around 30 employees. What is your way of ...
0
votes
1answer
39 views

How to init connection with a Cisco over serial & minicom?

Trying to connect to a Cisco router, in purpose to learn Cisco skills that could help me finding a job. So, I plugged a cable in the rj45 Console (blue) port of a Cisco 888 router, and other end into ...
2
votes
2answers
42 views

How to access Cisco 2500 series admin GUI interface with known IP address when Firefox/Chrome state connection cannot be reached?

I know the username and password of my Cisco 2500 series wireless & ethernet controller and its IP address, but when I enter the IP address into a web browser (Firefox and Chrome) it states the ...
0
votes
1answer
42 views

Unicast and Multicast MAC address convention

I need help in understanding how Unicast and Multicast MAC address is differentiated as explained in wiki. According to what I understood, when the least significant bit is set as 0 in the first octet ...
0
votes
1answer
18 views

Blocking 2 VLANs from accessing a specific VLAN on a network

I'm working on a project in packet tracer and I have a server connected to VLAN 10. VLAN 10 has a single server device on it and the IP scope is a /30. I have 8 other VLANs across 2 sites. The 2 ...
0
votes
2answers
50 views

Unable to ping but I can see the arp in switch 4451

Recently I got to know that I am unable to ping the IP addresses behind vlan236 from core1 whereas I am able to ping the same from core2 and able to ping the IP address of vlan236 from my laptop as ...
0
votes
1answer
71 views

Trunking multiple VLANs into a single trunk port on a 3650 Switch

Morning: I'm new to the world of Cisco Packet tracer, and I am creating a network for a uni project. So far, what I have is: 5 VLANs (subnetted to 192.168.2.0/26, 192.168.3.0/36 etc) All are ...
-1
votes
1answer
66 views

Port Channel issue on Cisco gear

I have a lab where I'm connecting a Cisco CSR1000V and a Nexus 9000 switch. These devices are connected back to back. Relevant configuration is: Router: interface Port-channel1 mtu 9216 ! interface ...
1
vote
0answers
8 views

Computer getting Unable to Identify Network UNLESS Vlan is changed [closed]

This is a problem that has long plagued this environment. At seemingly random times (measured generally in months), a computer may suddenly lose connectivity to the network. It still is able to send ...
1
vote
2answers
86 views

EIGRP route redundancy in a ring topology

Within GNS3, I am attempting to configure five Cisco 3660 routers in a ring topology with EIGRP, as an early exercise to try and learn how to use EIGRP: These routers and virtual PCs are configured ...
0
votes
2answers
31 views

Show ports in use on Catalyst 3570

I picked up a used C3570 and am new to IOS. I am trying to ask the switch to show which ports are in use. My searches lead to the command "show modules" but that's refused by the switch (...
1
vote
2answers
142 views

EVPN/VxLAN border-leaf question

I have couple of question in above design where i have typical clos network design and my leafs are configured for Cisco vPC for redendency and anycast gateway and running OSPF for underlay and BGP ...
0
votes
1answer
28 views

Cisco ASA: What is the best way to restrict access of nodes in the same network to each other? [closed]

There is a network with five nodes on one interface. These nodes should not be accessible to each other. An option is to use an ACL, but is there another way?
0
votes
2answers
126 views

OSPF routes through L3 Etherchannels

I have been working on the setup below and basically I can't have OSPF populate the Routing tables of the L3 switches. I have properly set up L3 Etherchannels between them with the proper addressing. ...
1
vote
1answer
52 views

PortFast For Some Networks But Not Others

I have 4 offline self contained networks. They are setup as such: Network 1: Windows Server 2016 As Domain Controllers And Windows 10 (1909) Clients Connected by Cisco C9300-24Ps. Network 2: Windows ...
0
votes
2answers
236 views

How to add multiple computers in cisco packet tracer?

Hey, I'm the newbie of Cisco Packet Tracer. In the image as you can see there are lots of computers(0-99,1-200). I couldn't do that. Is it possible or it just some way of describing how much computers ...
0
votes
0answers
10 views

Assign to each of the devices(computers, routers etc) an IP address using as default Network IP address: 192.168.4.0 /24 (Use VLSM for subnetting) [duplicate]

when my professor gives me Homeworks I had the number of hosts(so then I can do the necessary calculations to find the IP addresses)but in this project, I have to find it by this given IP address: ...
2
votes
1answer
204 views

Two Datacenter location with same BGP AS number

Currently we have DC-1 running eBGP with my ISP using AS:1111 and i have prefix 1.1.1.0/24 and using BGP Default route because we have only single ISP. Now we are opening new Datacenter in remote ...
1
vote
1answer
53 views

QoS Policy to not overutilize WAN link

I have a configuration on a Cisco C897VA-K9 router that has a built in DSL modem. It has a simple internet connection via VDSL. There is a VPN configured on the device, that connects back to our main ...
0
votes
1answer
18 views

Traffic flow of tunnel interfaces

I would like to understand traffic flow in a router. In what direction do i need to apply a policy-map in order to affect traffic? Especially regading tunnel interfaces, as traffic both comes and goes ...
0
votes
1answer
39 views

Can Cisco Config cause Unidentified Network

I have a Cisco C9300-24P layer 2 switch with a dozen computers and 2 servers on the same VLAN, all statically set with no default gateway as there is no router and all offline from the internet. The ...
1
vote
1answer
307 views

Is there a Gigabit switch in packet tracer (more than two gigabit ports)?

I am trying to configure a packet tracer based on a scenario. I am wondering if there is a way to get a GigabitEthernet 0/5 and a GigabitEthernet 0/6 interface on any of the switches? I have tried ...
0
votes
2answers
67 views

IPV6 static Routing

I'm new to networking and I'm currently learning about IPv6 in static routing. I set up an environment in Cisco Packet Tracer like this: have connected two routers with serial medium , each router ...
1
vote
3answers
104 views

Have we failed a wireless survey for something that couldnt have been offered?

On a large campus wireless network (approx. 500 APs, 4-5000 connected devices) we have been asked to create an SSID for some specific equipment that can only work on the 2.4Ghz range. No problems with ...
0
votes
3answers
127 views

Can link aggregation be substitute for stp protocol?

Can link aggregation be a substitute for STP protocol? I mean can I use 2 links with Link Aggregation to connect two switches for higher availability as an alternative to STP protocol?
0
votes
2answers
102 views

BGP influence outbound traffic based on prefix

I have two router core1 and core2 connected with ISP router border1 and border2 using eBGP peer and i have 5 public subnect (/24). My ISP sending me default route instead of full BGP table. Question:...
1
vote
3answers
74 views

Static NAT and PAT

I have two private IP addresses, want to make them NAT to 203.0.113.0/2 public IP address. WAY 1 : Static NAT (2 ip addresses NATted to one by manually) WAY 2 : PAT (Router gives port number ...
0
votes
0answers
76 views

vPC + HSRP load-balancing issue on Cisco CML 2.0 lab

I am playing with new cisco cml 2.0 lab simulator and seeing strange behavior not sure if its real issue or limitation of cisco lab. dist1 and dist2 is my vPC (NSOX 9000v) peers, and tor1 is IOSv ...
3
votes
2answers
56 views

Understanding traffic flow on SVIs [closed]

I have a simliar question to this one: Access-Lists and VLAN and understanding traffic flow But my question is concerning service-policies. Have a look at the image above. I triet to make a traffic ...
1
vote
1answer
44 views

BGP Community Policy to only allow single Community tagged routes

I have a requirement to do a Cisco IOS-XR Route-policy to allow only routes that have a single community tagged and not allow routes with multiple community tags. I built a lab that has two routes: ...
1
vote
2answers
79 views

Cisco Nexus N9K-C92160YC-X kernel panicking at bootup and stuck in endless powercycle

I believe I have a bad Cisco Nexus N9K-C92160YC-X. I received this switch on loan from a customer with a blank configuration. I've recently learned that its warranty is expired and it's not ...
0
votes
1answer
76 views

Capturing dot1q packets with Wireshark on a PC

I have spent the last few hours trying to capture some trunk packets so I can see and examine the dot1q VLAN field. I have tried mirroring the trunk port to my PC using the following commands on Cisco ...
0
votes
1answer
104 views

Adding fast ethernet ports to a server in packet tracer

How can I add more than 2 fast ethernet ports to a server in packet tracer?
0
votes
0answers
40 views

IPv6 - link-locals mess

I am implementing IPv6 in my network and for now I have my own routable IPv6 /48 block, Cisco routers, Cisco switches, OSPF between them and several hosts. Its all working fine, but there is something ...
1
vote
3answers
84 views

CRC errors in DC, ruled out L1 issues

I have a very strange problem with links in one datacenter and I'm looking for some other solutions I haven't looked for yet. We have a network based on Cisco Nexus 3K and most of the core links ...
0
votes
2answers
52 views

Sending tagged traffic to untagged port?

What happens when an untagged port receives tagged frames, whether they are dropped or not !?. Say, A computer is connected to a switch on untagged port (as most would recommend). On it I have used ...
1
vote
1answer
35 views

Is is possible to send traffic from custom vlan to vlan 1?

I have a problem with understanding networking. Can you help me to understand if i'm right or not and what's the best solution, please? I'm trying to extend L2 network to the cloud and use current ...
1
vote
0answers
31 views

Cisco QinQ - More than one s-vlan on dot1q-tunnel for the same c-vlans

I have a scenario where I have 3 service vlans (10,20,30) from a trunk port and need to brige our customer vlans (100,200,300,400) between all the service vlans. I need to do it all in the same switch ...
1
vote
2answers
72 views

ping in the same VLAN with multiple switches in between

Refreshing VLAN knowledge with PT7.3, I came across some unexpected behavior. Why does a chain of switches having proper trunk configuration between them DROP packets? Trying to ping hosts from the ...
0
votes
1answer
28 views

Meraki AP reboot?

Does Meraki WiFi Access Points reboot after 4 Hours of not getting reach-ability with Cloud Controller?
3
votes
2answers
254 views

Lost communication with automaton if a switch is used

We have an architecture like this : 2 supervision computers connected to an automaton that is connected to multiple PLC. When the computer is directly connected with the automaton, there are no ...
0
votes
0answers
21 views

Subnetting for this question, please? [duplicate]

As a Network Support Engineer, you are tasked by your Supervisor with assigning IP addresses for your new MAN( Metropolitan Area Network) which consists of seven (7) different branches, each branch ...
1
vote
1answer
241 views

Cisco anyconnect VPN router specific public IP via tunnel

I have fully functional cisco Anyconnect VPN running on Cisco ASA5585-X and today i got requirement that there are some remote public sites we need to whitelist our VPN public IP to access them over ...
0
votes
0answers
11 views

SD-Access -only VNI's and SGT's for policy enforcement within the fabric?

I’m currently getting myself up to speed with Cisco SD-Access. Particularly policy enforcement. Am I right in saying that as SD-Access utilises VNI’s and SGT’s from which to enforce policies. Then ...
0
votes
0answers
14 views

VLSM Scheme Approach [duplicate]

I have been asked this question in a Cisco Packet Tracer. It is testing my knowledge of designing and implementing a vlsm addressing scheme. The requirements are: You will subnet the network ...
0
votes
3answers
60 views

How to communicate Different VLANs in Different Switches

I have 3 switches, 2 switches connected to 1 main switch. I have VLAN6, VLAN7, VLAN8 and VLAN9. VLAN6 has VLAN6-1 end device. VLAN7 has VLAN7-1 end device. VLAN8 has VLAN8-1 and VLAN8-2 end devices. ...
0
votes
1answer
203 views

Cisco Nexus RADIUS authentication privilege issue

I'm trying to set up RADIUS authentication between a Nexus C93180YC and a Microsoft NPS Server. The RADIUS server is reachable and I'm able to log in and get permission granted, but the network role ...
0
votes
0answers
23 views

First time Rancid (cisco)

is my first time using Rancid. -How can I set it up to get only a "show run" -How can I set it to add a "write" just before the "show run" -Which file is correct for editing this thx!
0
votes
1answer
70 views

How to set up VoIP inside local network without a VoIP server?

I have a task to set up VoIP inside a small network (~20 Cisco IP Phone 303). Only for calls inside the local network. I have no previous experience with VoIP and I want to do everything in the most ...
1
vote
1answer
58 views

eBGP failover without packet drops

I have core1 and core2 router peer with same ISP but distinct hardware and they are sending us default route. currently all in/out traffic going over to core1 and core2 is idle (standby), I have iBGP ...

1 2
3
4 5
69