Questions tagged [cisco]

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ip dhcp snooping Kills DHCP Ports

I am working on implementing DHCP Snooping on my switches and have found that when I do so it kills the DHCP connection to the clients. The network is as such: The server with DNS is providing DHCP ...
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Why does a Cisco router advertise a prefix with NDP RA when it has an address in that range?

If I write interface Vlan1 ... {ipv4 config} ... ipv6 address 2001:DB8:5432:101::/64 eui-64 ipv6 address FDAA:DB8:5432:101::/64 eui-64 ipv6 enable ipv6 nd prefix 2001:DB8:5432:101::/64 ipv6 nd ...
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Working with credentials encrypted credentials on Aruba / HP switches

I come more from a cisco back ground and there when i show the running configuration i can see the encrypted / hased local user password. This makes it more secure to have in a automation tool where I ...
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Does modifying a ASA tunnel create a downtime?

I inherited a cisco ASA, I never really had to manage one before. But, I need to modify an existing tunnel to add IP addresses to both the local and remote traffic selector, specifically there are ...
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What are the benefits of using MP-BGP multicast address family, under the context of inter PIM domains multicasting?

Under the context of inter PIM domains multicasting, 1 RP on each PIM domain (2 domains), attached with eBGP, with MSDP peering to exchange the actives sources, what are the benefits of using the MB-...
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What is Cisco ACI command equivalent to Cisco IOS `show version`?

Based on this link, Cisco ACI is actually based on the Cisco Nexus 9000 family. The hardware for it is based on the Cisco Nexus 9000 family of switches. https://www.sdxcentral.com/data-center/...
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633 views

How to configure IP addresses in cisco packet tracer?

Hello I am working with Cisco packet tracer. I have two laptops connected to a wireless router with IP addresses assigned using DHCP. The router's Internet IP address is 10.1.0.0 and the LAN address ...
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Accessing HTTP Secure Server on Cisco IOS

I have a Cisco ISR4331/K9 running IOS XE Version 16.09.04 which I have configured with a hostname, domain name, and generated 2048 bit RSA keys on, I have also verified the clock is set correctly. ...
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How does a Cisco router determine if a packet is IP routed or label switched?

How does a Cisco Router (IOS-XE) decide if a Packet will be MPLS Label switched or ip routed? In a Juniper MX MPLS Pathes have an own Administrative Distance (or Preference in Junipers wordings) So ...
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118 views

BGP Cisco best practices to filter client asn and prefixes

I have two bgp routers. OSPF as IGP and on Loopback's iBGP. Both routers have different peers, but both receive full routing table. I have to connect client through BGP and give him full table. Client ...
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BGP Cisco internal and external distance

I have two bgp routers. OSPF as IGP and on Loopback's iBGP. Both routers have different peers, but both receive full routing table. In google I found on many presantations "bgp best practisec&...
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Ikev2 ipsec issue between Asa and sonicwall (issue resolved) but need understanding

Really need your help Need help in understanding an issue faced when creating a tunnel between Asa and Sonicwall (Issue got resolved) still need help to understand. SonicWall: Phase 1 Ikev2 Encryption ...
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Cisco 2960x Stack IOS version mismatch

Hope some of you already have some hands-on experience with that - if you're adding a new switch to the stack and you get IOS version mismatch, can you still copy the bin image from the master to the ...
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Is it possible to configure DHCP on a router or UTM firewall for the multiple VLANs on L3 Switch?

I'm working on expanding our office network to accommodate more users/devices. Currently we have the DHCP configured on a UTM firewall(cyberoam ing50) device(cum router) providing IP addresses for ...
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1 answer
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Can't send message from RIP to static through BGP

Before deep into the question, please see this topology and the results of sending messages from one router to the other router: I have succeeded in sending a message from R0 to R2 (or vice versa), ...
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In gnss3, why can't I ping my cisco router from my VM?

I have the following network, I have never configured a Cisco router before so I'm having a little trouble. In router R1 I used the following commands to assign an ip to the router: configure terminal ...
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1941W wireless clients losing DHCP IP address [closed]

I am attempting to 'extend' a 192.168.1.0\24 network with an experimental network 192.168.10.0\24 using a 1941W router. I have configured 1941W to distribute a 192.168.10.0\24 network, with WLAN ...
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3 votes
1 answer
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TCAM carving question for Cisco Nexus 9396PX

TCAM carving question for Cisco Nexus 9396PX I have Cisco Nexus 9396PX and configure for IPv4 with IPv4 RACL on SVI to block some basic traffic. Now i have configured IPv6 and trying to configure ...
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Network topology with big spanning tree diameter

I have a quite big network with spanning tree diameter 26 (if I count it correctly). It is build on Cisco swithes (mainly Catalyst 2960 and Catalyst 1000, two SG350), running rapid-pvst. It is now ...
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3 votes
1 answer
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Cisco ACL numbering

This is a small technical question. I can't seem to find any information on this, so I thought I'd ask here. I'm currently studying for my CCNA and I'm currently on the topic of ACLs. On IOS standard ...
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356 views

What is the impact of "no switchport" with "no ip address"?

I've a monitoring tool named Spectrum from CA Click. It automatically forms links between devices by check their configuration, and etc. Recently a change was made on my switch by a regional and the ...
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question about 4500x enterprise license

i have a cisco 4500x switch and here is the license output : Switch#show lic all License Store: Primary License Storage StoreIndex: 0 Feature: entservices Version: 1.0 License Type: Permanent ...
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3 votes
1 answer
290 views

Many ways of configuring MPLS pseudowires, and choosing only one

I am discovering MPLS configuration on Cisco ASR920, and for almost any "thing" that can be configured, there is often two or more ways to do it. For example, given this configuration: ...
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1 answer
267 views

Cisco, Router can communicate; hosts cannot

I am learning CCNA related tasks, I have picked up a Cisco 1900 Series router. I am attempting to set it up behind my existing router (Comcast standard router). My "Real" network is 10.0.0.0/...
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124 views

EVPN+VxLAN strange silent host issue

EVPN+VxLAN very strange silent host issue I have very basic EVPN+VxLAN design where i used OSPF/Multicast/BGP/vPC technologies to build small size datacenter. L2VNI working great without any issue. I ...
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Ping using 127.0.0.1 [closed]

My question is about this case : I have a PC with 2 NIC (Network interface card ) , when I do ( ping 127.0.0.1) ** which nic will be the ping tested on ? **
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1 answer
34 views

EIGRP : Feasibility Condition not satisfied

What happen if the Feasibility Condition not satisfied and we can not pick a feasible successor?
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5 votes
1 answer
516 views

Finding the right BFD timers between Juniper QFX5110 and Cisco ASR1000

I am trying to configure BFD for both OSPF and BGP on the Cisco ASR1000 (non X) and Juniper QFX5110. The problem is that the QFX doesn't officially support BFD timers lower than 1000ms without ...
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3 votes
1 answer
151 views

Arista adding multiple route-map match interfaces?

on Cisco, I could do the following, route-map abc permit 10 match interface Vlan1 Vlan2 Vlan3 set metric-type type-1 But seems on Arista EOS I could only add one match interface, how could I add ...
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What is BTU/hr gauge of Cisco ISR4461/K9?

I searched everywhere but couldn't find it. If anyone knows the system, can answer? How much BTU (British thermal unit) /hr uses by this router.
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Is it possible to connect a router and a switch using fiber-optic cable in Packet Tracer?

Second question: Is there a way to connect a router and a switch using fiber-optic cable? I am trying to connect a switch that has multiple servers connected to it to a router. The switch that I have ...
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1 vote
1 answer
69 views

NAT cannot communicate with 2 network

I have configured BGP for routing and NAT for HQ and Branch. I can ping from windows / server to public IP and also Linux Mint ping to public IP. but, I cannot ping / communicate between network HQ to ...
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6 votes
2 answers
2k views

How do I know the switch is layer 2 or layer 3?

Is it possible to find the switch is Layer3 or Layer2 in (Switch)CLI? Is there any command to check whether the switch Layer(Layer 3 or 2) in CLI?
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How to Change the Date on Cisco Catalyst 3750x Switch

We are using cisco catalyst 3750x 24 port switch series How to Change the Exact Date(Singapore) on a Switch ASW-G-L09-001#show running-config Building configuration... Current configuration : 11883 ...
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1 answer
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Ping to default gateway failing

I am trying to ping to a default gateway which i have configured as 171.2.0.1 but somehow the ping is failing . I am new to network domain so i have less idea about it . Any help is appreciated .This ...
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131 views

ASA ping outside to inside private ip's?

i am new asa and cisco as well , what i am trying to do to perform this lab , only 1 issue is there , i need help in it, i can ping from pc0 to router0 in other way I can ping inside to outside , but ...
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1 vote
1 answer
43 views

Where can one find how much memory is currently allocated to logbuffer?

Do you know where it can be checked, how much memory is currently being used by the logbuffer? some-switch#show log | i Buffer|Trap|udp Buffer logging: level debugging, 2268 messages logged, xml ...
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1 vote
1 answer
639 views

BGP Best Path Selection Algorithm

According to this cisco document (https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html), shortest AS_PATH is the #4 algorithm in the sequence to evaluate, out of 13 ...
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How to deny ICMP from 1 host on the server - Cisco Packet Tracer

How I can to setup the server firewall to deny any ICMP traffic come only from host 1 while permitting the other. host 1 is a switch Vlan = 192.168.10.2/24 when I do Remote Ip = 192.168.10.2 Wildecard ...
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2 votes
1 answer
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Trex not receiving any packets

This is my setup to benchmark my server Diagram Trex version v2.88 Trex server MAC ens2f0: f8:f2:1e:5c:bf:78 ens2f1: f8:f2:1e:5c:bf:79 DUT server MAC eth0: fa:16:3e:1c:be:82 eth1: fa:16:3e:d5:37:b1 ...
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4500X performance question

i have a pair of 4500x in VSS with 950x SVI and 6x BGP peers with no full tables (there is no other configs) now i want to configure 4-5x GRE tunnel and and 1-2x gre tunnel will have around 500mbps ...
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192 views

Cisco ip helper-address

I am looking at the DHCP documentation and i cannot seam to find how to configure the router to use a loopback interface as the relay-agent. My objective is to use option 82 so that the dhcp server is ...
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3 answers
100 views

L3 switch vlan routing to another gateway

I have a allied telesis switch with VLAN10 & VLAN 20 and a basic ISP Router with no VLAN configuration. ISP router IP is 172.30.50.253 PC1: 172.30.3.x/24 Gateway 172.30.3.254 VLAN30 interface ...
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446 views

Per-VLAN DHCP pools on the switch

Let us say I have a switch on which I have created two VLANs 10 and 20. I have set ports 1-10 to be on VLAN 10 and ports 11-20 to be on VLAN 20. Presently the PCs in both VLANs are configured with ...
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Cisco IE4000 Blinking Amber Lights

I have an IE4000 Cisco Switch running my small air gapped network. I came in this morning and found that ALL the ports other than the Trunk port are blinking Amber. I checked the config and the ...
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How can I deny or block an IP Address in Cisco FTD

I have a Cisco Firepower Threat Defense firewall. I want to Block an IP and add blocked ip into BlockedIp rule. How can I achieve it via Web Interface or REST API ? Thank you!
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2 answers
169 views

How to Balance SPAN Traffic from Redundant Switches

So we are wanting to deploy an IDS device to capture EAST-WEST traffic in a LAN. The actual topology is more complicated but our issue boils down to this: We are attempting to configure SPAN sessions ...
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6 votes
2 answers
1k views

Undo last command(s) in case of losing connection to a Cisco Router

I would like to configure an interface on a remote Cisco router (ISR 4000 series) with IPsec. The only way to connect to it is through the interface that I am trying to encrypt. I want to ensure that ...
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test root-system password on IOS-XR

I've installed quite new NCS-5501-SE devices from Cisco. They're running well. I just remembered that then I initially deployed it, it asked me to set the root-system username and password, which is ...
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1 vote
3 answers
569 views

How to create/delete multiple VLANs in a single command?

If I want to create 3 VLANs, I've to do it one by one like this. conf t vlan 2 vlan 3 vlan 4 Same thing goes with deletion. conf t no vlan 2 no vlan 3 no vlan 4 Is there a way to do it in a single ...
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