Questions tagged [cisco]

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15 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: ...
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19 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 ...
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1answer
32 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 ...
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Cisco ASA 5545 updated from 9.8 to 9.10 - IKEv2 tunnels to vendors no longer work [closed]

Having an issue where updating the ASA from 9.8 to 9.10 stops all IKEv2 tunnels to/from vendors.
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20 views

Can I install a LAN switch between two WiFi routers? [closed]

I am new to this, so please bear with me. My problem concerns limitations with my ISP and my home WiFi network setup. Here is a diagram: (1) My ISP will only allow one (1) LAN port on their router (...
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Cisco switches replacement [closed]

We looking to replace our Cisco switches 3850, 2950 with others such as HP, Dell, ...etc to reduce network costs and build a NAC. So my questions are:- Compatible to work with Cisco DNA environment. ...
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1answer
26 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?
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37 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 ...
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2answers
47 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 ...
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2answers
25 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 ...
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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 ...
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26 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 ...
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2answers
40 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 ...
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10 views

Meraki AP reboot?

Does Meraki WiFi Access Points reboot after 4 Hours of not getting reach-ability with Cloud Controller?
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2answers
243 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 ...
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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 ...
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1answer
31 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 ...
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7 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 ...
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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 ...
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1answer
36 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. ...
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1answer
38 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 ...
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22 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!
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1answer
34 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 ...
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1answer
47 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 ...
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2answers
40 views

Communcation between vlans and router

Can all VLANs be allowed to communicate with a router but not between VLANs? If it is possible, then how to achieve it? The VLANs and router are in the same subnet. I have topology like this:
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1answer
32 views

Cisco 2960x: Adding a new cable to complete the “ring” with switches powered on - is it safe?

Let's say I've got a 2960x stack like the one shown below - as you can see one cable is missing as it was too short, so I ordered a longer one and am awaiting delivery. One thing I wonder about though ...
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20 views

can't find cbQosCMPostPolicyBitRate64 oid for cisco

i have use snmpwalk go get police Bit Rate Traffic policy-map(QOS) for my cisco ASR1006 but i need a 64bit barbecue my traffic is more of 5000Mbps so 32bit can't handle it . ~# snmpwalk -v2c -c aaa ...
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1answer
29 views

Inconsistent address and mask error

When statically routing a route in the format [destination network address] [mask] [next hop address or interface name], I get the Inconsistent Address and mask error. Any assistance would be ...
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1answer
36 views

VLAN Subinterface Removal - CISCO ASA

The below are the configuration of the subinterfaces in Cisco ASA firewall and currently sub-interface 0/1.1 is only passing traffic and I need to remove 0/1.2 configuration from here as it is unused. ...
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1answer
50 views

MTU size for PPPOE with QinQ

i used at as A pppoe server i have used QINQ secend tag in rotuer interface TenGigabitEthernet2/0/0.904 description Cust1-QINQ encapsulation dot1Q 904 second-dot1q any pppoe enable group PPPOE-...
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1answer
98 views

Cisco ISE migration to Azure cloud

I would like to if any one has migrated Cisco ISE to Azure. Any challenges faced, how migration planis done. Currently using ISE with Administration Persona - 2 VMs Monitoring Persona - 2 VM's ...
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1answer
33 views

Should DHCP Snooping trigger errdisable

I'm using Cisco 3750s, with DAI and DHCP Snooping enabled. We have a couple.. lets say "overly inexpensive" IP phones in the building that will periodically loose their lease and not attempt to ...
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1answer
28 views

Problem with getting IKEv1 tunnel between Cisco and Palo Alto to establish a tunnel more quickly

I have a Cisco 2901 router that has an IKEv1 IPSec VPN with a Palo Alto firewall. We had a problem with our existing VPN setup where it takes a long time to get the tunnel to come back up when re-...
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42 views

Upstream QoS garanteed bandwidth

In the network I'm trying to manage there is a satellite link, the upstream of which is ~ 7 Mbps. In this upstream, I need to allocate 1.5 Mbps of guaranteed bandwidth for one single host, but nothing ...
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2answers
83 views

How can I use an HTTP CRL on Cisco IOS?

On a Cisco 867 running IOS 15.6(3)M7, I'm trying to do the following: TEST-GW1(config)#crypto pki trustpoint vpn-p2s-server-11 TEST-GW1(ca-trustpoint)#crl query http://myvpn/crls/21.crl % URL must ...
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1answer
40 views

What is Netflow Scope field?

I was looking at RFC3954, RFC7011 and some Cisco docs - however I can't find the answer for what is the Scope field is? What information does it carry?
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36 views

Q-IN-Q Tunnel between cisco and mikrotik not work

i have try to make A Q-IN-Q tennel between two router (cisco and Microik) through cisco switch in mikrotik VLAN ID = 10 IN interface ether1 VLAN ID = 20 in interaface Vlan10 ip address in interface ...
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1answer
57 views

RSTP Sync received every 2 minutes after a TC

While digging into logs (debug spanning-tree event has been enabled) in order to troubleshoot communication losses after topology changes. I was able to notice once I triggered a TC, one specific ...
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2answers
98 views

Cisco nexus CRC error on interface

I have dual stack vPC setup between 4 cisco nexus switch as per above design. I have noticed recently that getting CRC error on cisco 3064 all 4 interface connected to N9K, and during peak traffic ...
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5answers
47 views

IP Helper in Multiple Access Switches

Just a dumb question.. I have 1 core switch and 5 access switches. Just wondering if it would be best to setup the IP helper on all access switches rather than just on the core switch? Does this ...
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1answer
30 views

Filter Packet PPPoE Discovery

i have a sw nexus i have a router BGN with vlan 50 is going to sw then mode access to Client 1 and Client 2 BNG ==== SW1 == PORT1 =Client 1 (Mode access vlan 50) PORT2 =Client 2 (...
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1answer
43 views

Multiple mac adrress on one cisco switch interface

How can i config Multiple mac address on one cisco switch interface? (I have 3 laptops and i connect only one laptop every time(I switch between them), and i want to config only one interface with the ...
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1answer
28 views

VTP pruning used in combination with allowed vlan

I have a network on which most of the switches are running VTP client/server mode. Few switches are not yet in that mode - for specific customization or because they simply cannot handle it. Thinking ...
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1answer
18 views

can't find notify syslog in cisco sw nexus 3000

in cisco IOS i was used "Configuration Change Notification and Logging" but in cisco sw-nexuis i can't fine the commend SW-nex3000(config)# archive SW-nex3000(config-archive)# log config ...
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1answer
34 views

Cisco packer tracer training - exercise 2.1.1.5 [closed]

I’m currently starting Cisco and using the packet tracer course, but I’m having an issue with a section creating a simply topology. Everything good apart from one thing which is from wireless router ...
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1answer
21 views

How to connect two routers to the same network via an F-connector? [closed]

To clarify the situation, my ISP gave me a Cisco EPC3928S router which has F-connector input like shown in the picture below. On the second floor they set an additional coax cable for the television. ...
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2answers
35 views

Routing daemon vs router configuration

Which is the difference between a routing daemon and a router configuration? For example using BIRD you can set up a BPG session, but you can always set up a BGP session for example using a CISCO ...
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25 views

uncorrected snmp Qos value from cisco

hello i have a router cisco 1006 and i create a policy-map with to class policy-map CheckBand-BandPerUsr class BandPerUsr police cir 10000000000 class class-default police cir 10000000000 ...
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1answer
56 views

Cisco router on a stick with public ip wan (ISP)gateway

I am trying to create a router on a stick with an outside facing sub-interface with a public IP from an ISP. I have tried to configure NAT and routing but I just cant get to ping the internet. I'm ...
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2answers
629 views

Why can't I ping the next hop router on a directly connected network?

I have the following scenario: I am using two Cisco 1941 routers Network A connected to Router1 (192.168.10.0/24) (Gigabit connection) Network C connected to Router 2 (192.168.20.0/24) (Gigabit ...

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