Questions tagged [cisco-commands]

Used for questions about the commands for Cisco devices.

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1answer
159 views

Migrating Configuration - 3750G to 3750X

What is the best practices to migrate configuration from an older Cisco switch model to a newer Cisco switch model? -I am not expecting to change any configuration, just simply want to be on the ...
0
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1answer
41 views

why do I need the network name between two routers for RIP routing?

the network in my exercise I am learning about networks and I just started to learn about dynamic routing(like RIP) but there is something I didn't managed to understand and is why do I need in the "...
0
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2answers
134 views

Why does yealink ip phone is not getting ip address from voice vlan?

I have configured separate vlan for voip and connected interface to it (as shown below). But the phone is not getting ip address automatically. switch- cisco 2960-x phone- yealink I had tried: (on ...
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0answers
77 views

How to configure ip phone on Cisco 2911 router with packet tracer

I am trying to configure my router to ping an IP phone and every tutorial I've read used the command "telephony-server". For some reason, this command does not work. I also tried "telephone-server" ...
4
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1answer
169 views

How to connect QSFP+ transceiver with MPO connector and SFP+ transceiver with LC connector?

In data center application, 40G QSFP+ transceivers with MPO connector and 10G SFP+ transceivers with LC connectors are most common transceivers. But, with two different connectors, how can we make a ...
4
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2answers
366 views

Trust dscp command missing on cisco 3850

We have an incoming QoS configuration on our 2960X switches like this: class-map match-any QOS_GL_TRUST match ip dscp 8 16 24 32 46 class-map match-any QOS_GL_CITRIX match access-group name ...
7
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5answers
1k views

Why does the Cisco show run command not show the full version, while the show version command does?

Is there any reason why Cisco show run does not show the full version which is 16.3.7 in this example? IOSSW#show running-config | include ersion version 16.3 while show version does? IOSSW#show ...
2
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1answer
63 views

Changing configuration on Cisco router

There is a Cisco router configured by another IT guy with specified addresses from ISP, now the problem is that the ISP give us new net mask and default gateway addresses, so what i did was changing ...
0
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2answers
83 views

Duplex Mismatch Detection

I'm trying to create a lab on PT to learn about duplex mismatch. I made one end of Fast Ethernet half duplex and other end is full duplex. I was hoping to see an increment in late collisions which I ...
2
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2answers
147 views

Cisco ip helper-address how exactly translation works?

Can anyone explain how exactly works translation from broadcast to unicast? What is changed or modified in IP packet? Already I have read how it works and configured it properly for my network but ...
0
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2answers
68 views

Cisco Catalyst pseudo interface?

I think I remember reading somewhere that you could have multiple VLANs assigned to a single interface by way of a pseudo interface. Googling with that vocabulary doesn't return proper results though, ...
5
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2answers
1k views

VLAN Interface is down, protocol is down

I have Cisco Layer 3 switch with IP routing enabled on it. I have different VLANs configured on it and its working perfectly. Now i have added another VLAN (SVI) and assigned that VLAN to one of the ...
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0answers
217 views

Query on Cisco IPsec Licensing, HSEC-K9

I'm currently debugging an issue with IPsec tunnels and it seems like one of our client's NW engineers didn't install the HSEC-K9 license. The issue is that the new IPsec tunnels are not coming up ...
-2
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1answer
37 views

Textbook has different order of commands: login password password-value and also password password-value login Does the order matter?

Textbook has different order of commands: login password password-value and also password password-value login Does the order matter? Cisco switch
2
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1answer
3k views

What does no shutdown command do? Cisco

Newbie here. I'm studying networking and struggling to understand the no shutdown command. I don't understand what no shutdown command actually does. I've read that it enables the interface but I don'...
6
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2answers
700 views

Cisco show log number of messages

When I run the "show log" command, it displays the latest 360 messages. Why 360? Can this value by changed? If yes, what is the command for that? Thanks.
4
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1answer
49 views

set cli complete-on-space Cisco equivalent

Does anyone know what would be the equivalent, if any, of the Juniper command 'set cli complete-on-space' for Cisco? I used to work with Juniper devices and I LOVED this feature, but now we are ...
2
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1answer
123 views

4507r Supervisor engines aren't operating redundantly

The tl;dr : I have two supervisor engines in a 4507r but the standby unit doesn't appear to be ready to perform when the active module dies. On Sunday I had a network problem that appeared to be ISP ...
0
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1answer
23 views

i cant configure the ip adress and subnetmask ,i only have one router “1941” and 2 pc's

the command line is this : Router0(config-if)#ip adress 192.168.1.1 255.255.255.0 the error message is : % Invalid input detected at '^' marker.
3
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1answer
884 views

I can't set a gateway of last resort

I can't seem to get to set a gateway of last resort on a router. I want it to forward anything whom's ip address is not in the routing table to router HQ through interface s0/0/0 by doing the ...
2
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1answer
126 views

Cisco Embedded Packet Capture with NAT

I love the ability Cisco's Embedded Packet Capture (EPC) provides to remotely troubleshoot dataflows on IOS routers. monitor capture buffer CAP_BUF monitor capture point ip cef CAP_PT gig 0/0.1 both ...
4
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2answers
503 views

spanning tree RootGuard question on vPC switches

I have following diagram and two distribution switch connected back to back over vPC Related spanning-tree question is it ok to use RootGuard on both distribution switch where access switch is ...
3
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1answer
174 views

Set password of a Switch to “C?1sc0” using CLI in Cisco Packet Tracer

I have been asked to set the password of a Switch to "C?1sc0" in Cisco Packet Tracer. The problem is that when i type "?" in CLI it prints out: Router(config)#enable password ? 7 Specifies a ...
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2answers
750 views

How to assign all interfaces in one router to OSPF backbone area?

Is there any command to assign all interfaces in router (CISCO 2691) to OSPF backbone area? I was using this command for each interface. network address wildcard-mask area area-id Where wildcard ...
1
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0answers
241 views

VLANs still exist on my switch as I reset it [closed]

I reset my Cisco 3750 by write erase and then del the vlan.dat file from the flash and reload it... but sh VTP status is still showing the VLAN... why are the VLANs still there after I deleted the ...
2
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1answer
3k views

How to configure DHCP pools for 2 VLANs/subnets sharing a switch

I've set up DHCP pools on a layer 3 switch that goes out to 13 layer 2 switches. Most of which have their own subnet and VLANs, and everything works fine when that's the case. But when there are two ...
0
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2answers
614 views

Naming a VLAN with a space in name

I am supposed to name 2 vlans, VLAN 10, and VLAN 20. When I type Switch(config-vlan)#Name VLAN 10 ^ % Invalid input detected at '^' marker. Could I get any help please.
1
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1answer
199 views

ASDM access broken on Cisco ASA 5505 - NAT rule gone wrong

I was trying to setup NAT and Access Rules and apparently did something very wrong because now I cannot get into ASDM at all. I've tried multiple machines and all of them time out. Also the landing ...
1
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1answer
680 views

Management Plane protection (MPP)

I'm new to networking. I was trying to understand What MPP is ? What kind of attacks is it preventing? How is it securing router from those attacks?
3
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1answer
15k views

Diffrence between “wr” and “copy running config to startup config”

For saving configuration in Cisco devices we have "wr" and "copy running config to startup config" i am curious what is difference between these two command.
3
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1answer
357 views

Fix our Cisco switch overwhelmed by console logging

I have a setup with dual redundant Cisco catalyst 4506-E using the WS-X45-SUP8L-E supervisor engine and two 48-port switches below it. My task is to access and modify the switch configuration. ...
1
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1answer
111 views

2 Wan DHCP to cisco router

I have a cisco 2921 router and 2 wan ips provide by 2 diferents isp via dhcp. The main connection is funtional right now, I have a subnet with a nat to this ip, but I want put the second ip just to ...
5
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1answer
2k views

How to Disable telnet on Cisco switch totaly?

I have disabled telnet on Cisco 2960G switch by putting: line vty 04 transport input ssh but now when I try telnet to the switch I get message saying,password required but not set I am wondering ...
1
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1answer
91 views

Cannot log in to a Cisco 891W via terminal, ssh

I have already referred to this similar question: Telnet or SSH into a Cisco router but the procedure did not work for me. I have a Cisco 891W. I am able to log in via the console port just fine with ...
2
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1answer
442 views

Cisco ASA IP object vs TCP/UDP object wrt VPN Filters

When it comes to managing access rules in Cisco ASAs I always use ASDM because it's easier for me to visualize, troubleshoot and manage. I recently created a VPN filter for a S2S IPsec VPN and ...
1
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1answer
540 views

Pix 6.3 to ASA 9.2 migration

I inherited a production Cisco Pix 6.3 firewall and an unconfigured ASA 5512 9.2. I'm reading up on converting the existing Pix config to an ASA-compatible config and there's mention of a migration ...
4
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1answer
161 views

EHWIC-1GE-SFP for Cisco 1941

I was able to configure the interface but only the GE port is working, not the SFP port. Did I miss something?
5
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1answer
151 views

What commands do I run to change IP NAT settings for a Cisco 2800 series router

I am using cisco 2821 router. Initially other person has configured that router. But I just want to change one thing in that router. I need to change this below line. ip nat inside source static tcp ...
1
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1answer
55 views

EIGRP manual summarization prevent dual query

In EIGRP, manual summarization will prevent/ limit dual query. Is it true ? How can we limit the dual query by introducing manual summary ?
1
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1answer
46 views

Where did `private_sg-0` come from?

I'm configuring my first Cisco product (WS-C3560CX-12TC-S) and trying to get to grips with aaa. I'm used to *nix where the first thing you do with headless devices is enable and configure SSH access ...
1
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1answer
100 views

IP SLA with follow on actions

Good day, I have an odd one here. I am wanting to run an IP SLA to ping another device in the network, and if it stops responding, or the interface goes into a down state. I would like it to run a ...
3
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1answer
97 views

Should I always use “no ip address” command?

I'm studying networking and GNS3. In every example I see that before configuring an IP (IPv4 or IPv6) address of an interface, there is always the command "no ip address". Why they write this command? ...
2
votes
1answer
680 views

Firewall and VPN functionalities for a Cisco ISR4321 V/K9

I would like to know if I can setup ACLs with the access-list command with a Cisco ISR4321 V/K9. Are there restrictions (in comparison with a Cisco ISR4321 VSEC/K9)? Note the SEC part in the reference....
4
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1answer
3k views

Create a internal connection between ISR 4451 and EtherSwitch submodule

In a Cisco ISR 4451 we install a EtherSwitch 48 Port Module. The ISR is working and the EtherSwitch Module too. Now I want to create a route from ISR to EtherSwitch and read some Manuals and Forum ...
2
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1answer
1k views

How to configure site to site VPN between Cisco ASA and Cisco router? [closed]

I have CISCO ASA on one site and CISCO ROUTER on other side, both have outside interface facing public IP and doing NAT for internal VLAN's. How to connect different VLAN's on one site to VLAN's on ...
2
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1answer
647 views

Best way to setup VRRP if a router fails

I'm doing my VRRP networking lab. My understanding is if the Master failed then Backup will take over. In this scenarios, I have two layer 3 SW are connected together over LACP, and these two layer 3 ...
0
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1answer
466 views

Basic IPv6 Static Routing (Global Unicast Routing)

I have a topology like this: Every PC and router is configured with IPv6 addresses. -PING from PC1 to R1 is OK -PING from PC2 to R2 is OK -PING from PC3 to R3 is OK -PING from PC4 to R4 is OK ...
3
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2answers
10k views

Telnet or SSH into a Cisco router

I would like to log into a Cisco router that is in a LAN via telnet or ssh as user <username> with a password <password> only from machines in the LAN 192.168.2.0/24 About the user: I ...
1
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2answers
2k views

Cisco `ip ssh source-interface` refers to server, client, or both?

If I do ip ssh source-interface g0, that restricts: which interface the Cisco device listens for SSH connections, which interface it is allowed to use for the client to connect to other SSH servers, ...
2
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2answers
281 views

Cisco 2911 - display location using the show line command

On a Cisco 2911 terminal server, if I run the command show line, it will present info about the console ports like this: 0/0/0 3 TTY 9600/9600 - - 3 - - 116 162 671/0 -...