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Questions tagged [cisco-commands]

Used for questions about the commands for Cisco devices.

3
votes
2answers
62 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
votes
5answers
963 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
votes
1answer
60 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
votes
2answers
59 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
votes
2answers
76 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
votes
2answers
51 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, ...
4
votes
2answers
109 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 ...
0
votes
0answers
60 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
votes
1answer
34 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
votes
1answer
344 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'...
5
votes
2answers
342 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
votes
1answer
47 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
votes
1answer
50 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
votes
1answer
22 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
votes
1answer
369 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
votes
1answer
71 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 ...
5
votes
2answers
320 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
votes
1answer
127 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 ...
1
vote
2answers
390 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 ...
2
votes
0answers
139 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
votes
1answer
948 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 ...
1
vote
1answer
375 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
vote
1answer
132 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
vote
1answer
410 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
votes
1answer
6k 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
votes
1answer
245 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
vote
1answer
88 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
votes
1answer
1k 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
vote
1answer
68 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 ...
1
vote
1answer
377 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
vote
1answer
417 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
votes
1answer
145 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
votes
1answer
142 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
vote
1answer
53 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
vote
1answer
45 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
vote
1answer
83 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 ...
4
votes
1answer
79 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
561 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
votes
1answer
2k 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
votes
1answer
885 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
votes
1answer
524 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
votes
1answer
353 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
votes
2answers
8k 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
vote
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
votes
2answers
226 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 -...
0
votes
1answer
301 views

Telnet timing out [closed]

I am working on a project for a class/internship. In it, I need to configure a router to accept telnet. The connection is just timing out. To explain, I have an unmanaged switch between the router I ...
1
vote
1answer
575 views

How to enable SM-X Module in cisco ISR 4451 Router

While plug in a SM-X-ES3D-48-P Etherswitch Module into a Cisco ISR 4451 the Ports for this Module didn't came up. What I need to do to get the Ports enable with sh ip int br command? The Output of ...
6
votes
2answers
984 views

What is the difference between “ip domain name” and “ip domain-name”?

I'm running a ISR 4221 with "Cisco IOS XE Software, Version 16.04.02". I see that it has both ip domain name and ip domain-name commands. Why? Is this some sort of compatibility thing? My 7206 ...
1
vote
1answer
582 views

Logging syncronous command unrecognized

I have a Cisco SG300-10 with software version 1.3.7.18. The switch is configured as a layer 3 device. I'm trying to stop the log message from interfering with my commands. I have tried to type logging ...
1
vote
2answers
926 views

What do the two different reload times mean in show version output?

We're rebooting several ASR920s from the command line (to upgrade the IOS) and a couple have failed to come back up at first. These two have very different times for returned to ROM and restarted. ...