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.
3,748
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Hide private IP address
DS has 7 VLANs and 7 DHCP pools respectively. There are 3 trunk links to 3 access layer switchs to share VLANs. Its VLAN interfaces and DHCP pools:
ip dhcp pool vlan10
network 192.168.10.0 255.255....
- 27
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1
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28
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what is the relation between DTP and VTP?
the ideas behind VTP & DTP are different, then why do we need to make sure that the VTP domain on both sides is the same otherwise the DTP will not work?
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ACLs block connection
Here is my configuration on ISP router:
interface GigabitEthernet0/0/0
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/0/0.10
encapsulation dot1Q 10
ip address 192.168.10.1 255....
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1
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Why No Ping When Use Static and RIP in This Network?
I am a learner. I learned somewhere that we could use static and dynamic routing in the network.
I built the simple network shown in the attached picture.
I configured router8 with static routes to ...
- 285
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94
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VPN doesn't work
I'm trying to configure VPN between 2 routers:
R1: public IP is 200.0.0.6/30 on S0/0/1, private IP are 10.0.0.0/8 and 20.0.0.0/8
R3: public IP is 210.10.0.6/30 on S0/0/0, private IP is 192.168.3.0/24
...
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85
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Can't Pass 1 VLAN Through Trunk
I have 2 Cisco switches running IOS with VLANS 20,30,40,50. On SWITCH1 I have servers on Ports 1,2&3 on VLAN 30. I also have a laptop on port 5 on the same VLAN 30 and can ping the servers. They ...
- 461
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233
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Cisco 9500 switch stack
I have a cisco 9500 switch that is live/up in productions but I need assistance or more information on how to add a few more switches to create a switch stack and would like to be pointed in the right ...
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877
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SSH Config on Nexus Switch
Having trouble configuring SSH on 2 Fiber Channel Switches (NX-OS). Any Cisco experts here that can help?
I am pretty new with Cisco and having trouble looking for documentation on SSH config for ...
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1
answer
69
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Cisco DNAC - case insensitive search
Is there a way to do a case insensitive search using the Cisco DNA api?
Desired results: devices named “TEST”, “test”, “Test” etc
import request
url = "https:///dna/intent/api/v1/network-device?...
- 1,351
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36
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DNAC command accounting
We are trying to integrate DNAC with ISE purely for Tacacs. We are able to authenticate and authorize users fine via Tacacs but we are not getting any tacacs command accounting sent to ISE.
Intention ...
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3
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1
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56
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Spanning-Tree vlan priority on a pass through switch
I am still understanding a bit about this priority for spanning-tree on VLANs. I have a SWITCH A that is the root of a VLAN. It trunks through SWITCH B with no ports on that vlan. SWITCH B trunks to ...
- 461
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2
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130
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What issues can rise from web gui config changes then making other changes from the CLI?
I'm using a 9200L Cisco switch
If I make changes in the CLI, then I make changes in the Web interface and vice versa.
Will there be issues down the road with the config file getting corrupt or ...
- 131
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1
answer
28
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Do wiremap testers detect split pairs
I was watching a How-to video on Youtube on wiremap testers and the technician said that wiremap testers detect split pairs among other wiring faults. However, I came across a Networking question ...
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67
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HSRP does not work on two switches. Cisco
The problem is this: clients receive IP addresses from the L31 DHCP server, but they cannot ping the gateway, although HSRP seems to be working, there are no problems, I suspect that this is a bug in ...
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57
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CISCO cellular Router cannot reach network via my PC
I configured the cellular and my router is connected to the internet ping (5/5) Success
but I still cannot access the internet via PC
Here is my running-conf
Current configuration : 2271 bytes
!
! ...
- 11
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74
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Cisco device chooses link with higher cost as the root
The problem is that psw11 (SG350-28P) is choosing the path to sw10 (C2960L-48TS-LL) with a cost of 20000 as the root instead of the path to sw56 (C2960L-48TS-LL) with a cost of 10000, even though the ...
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42
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Deleting description on Cisco 9300 switch
I have a port that has a description that is not needed. How do I go about just deleting that line. Sorry for the simple questions, I am very new to the networking world.
interface GigabitEthernet3/0/...
- 41
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1
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61
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Cisco ca-trustpoint Not Adding SAN For CSRs
When doing the following to make the CSR for a certificate I add the IP Address line. But when I look at the certificate it doesn't look like the IP address is added to the SAN. In fact the ...
- 461
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18
views
I am getting Confused with host bits and Subnet bits [duplicate]
So i am playing with Cisco CML. I made up a random address 3.0.0.0/8.
I wanted to split up that subnet into 4 subnets, So 2^2 = 4. I kinda got confused along the way. In my train of though if we use ...
- 33
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12
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First usable addresses [duplicate]
Network id: 173.128.0.0/18
We have two different networks
Network A has 3319 usable hosts and Network B 126
I calculated their subnet masks, but now I am not sure how to calculate their first and last ...
- 1
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59
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Single-Mode Fiber Optics
I am learning for CCNA. The textbook says that a switch port costs more for single-mode optic fiber than for multi-mode fiber.
I guessed this is because the light source in the interface component ...
- 125
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108
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How should edge switches have their routing configured (when there is a mgmt vlan in the mix)
I'm having trouble with a new network topology we are trying to implement onto our environment. The issue seems to be with the switches. The problem is not relevant to this question but for ...
- 113
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108
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BGP outbound traffic engineering in multi-homed network with 2 ISP's
I have network with switches at access layer and 3 host networks, 2 core routers , 2 border routers , that have iBGP connection with each other and ospf with other 2 core routers, also each of them ...
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87
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How To get active vpn(site tot site) count from cisco FTD using ansible
I have been trying to get active VPN count from FTD firewalls using ansible, I tried the same on ASA and it have been running successfully. But when comes to FTD ansible, As it uses httpapi instead of ...
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votes
2
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354
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Which device gets the helper-address?
Brand new to networking and trying different scenarios.
PC2 can successfully send packets to PC1 and the DHCP server if a static address is assigned. However, PC2 will not obtain a DHCP address from ...
- 43
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1
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60
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No Ping Through Cisco Trunks
I am trying to ping on my management VLAN across a trunk between 2 Cisco switches. Both switches have the following configs
interface TenGigabitEthernt1/1/1
switchport trunk native vlan 5
switchport ...
- 461
0
votes
2
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185
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Switch Renumbering
We have a switch stack with six Cisco 3850 switches in it and for some reason the physical order of the switches in the cabinet and the switch number are not in sync. This is causing confusion; when ...
- 381
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319
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Bash script to gather serial numbers from list of cisco switches
I have pieced together a script to login to each switch listed in the file switch.txt, grab the serial number and place it with the IP address into the CSV serials.csv. The problem I am having is that ...
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1
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937
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How to find out the IP of MAC Address?
Below is the "terminal monitor" output
%PM-4-ERR_DISABLE: security-violation error detected on Gi1/0/35, putting Gi1/0/35 in err-disable state
%AUTHMGR-5-SECURITY_VIOLATION: Security ...
- 145
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59
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how can I find out deployment date?
How can I find out what date the switch is` deployed first time or any closer date or anything that I can estimate? Consider the switch is huwaei/dell/cisco/aruba.
Thanks
- 145
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3
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187
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Cisco radius auto vlan assignment without ISE
I read in a lot of tutorials that i must have the ISE engine to implement auto vlan assignment using the
authentication event fail retry 3 action authorize vlan 2
command on a cisco switch? Is that ...
- 79
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87
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SPAN/RSPAN monitoring VLAN vs Interface
I am a little lost with regards to the concept of capturing every traffic passing a core switch. If we set our monitor source to be all VLANs in a L3 switch, does that mean that traffic coming from a ...
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2
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55
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Add ip-helper to vlan did not have an ip address
I have a question
i have vlan921 did not have ip address in the Core switch, I'm able to add the IP-helper to it and will not causing me any issue?
interface Vlan121
description data
no ip address
...
- 41
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97
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Why `commit replace` left traces of login accounts on Cisco IOS-XR?
Wiped the startup-config with commit replace on our ASR 9006 routers in the global config. Noticed that after a console timeout that it prompts for an account to login. Logging in with an old account ...
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Identify first six /49 blocks out of ABCD::/32 [duplicate]
The answer is given as
ABCD:0000:0000:0000:0000::/49
ABCD:0000:0000:0000:8000::/49
ABCD:0000:0000:0001:0000::/49
ABCD:0000:0000:0001:8000::/49
ABCD:0000:0000:0002:0000::/49
ABCD:0000:0000:0002:8000::/...
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1
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94
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Cisco Meraki versus Cloud-Based WLC Deployment
A networking course that I follow mentions that we can centrally manage our APs in the cloud and that Cisco Meraki is a popular solution for that.
But then again, we can also have a Cloud-Based WLC ...
- 759
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1
answer
35
views
Is there an IGMPv1 querier router after all?
I recently looked into the mechanics of IGMPv1 and v2. Reading RFC 1112, I understand that in IGMPv1, the Querier Router functionality does not exist. All IGMP configured routers in a local network ...
- 183
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28
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Cisco Firewall 5512 NAT cause IP randomly mapping to the host
I have an ASA 5512 firewall that has configured with 2 public IP addresses.
I use static nat to explosive https service and use PAT to allow my DMZ web server to access the Internet. The CLI are shown ...
- 1
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votes
2
answers
145
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Cisco 9200L has empty config after IOS update
I have uploaded the newest recommended image on a C9200L switch, and its running the new version now. But the config is empty. Do i need to copy the old config again or how do i recover the old config ...
- 79
3
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2
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194
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NETCONF namespaces
I am trying to extract information via NETCONF from an IOS-XE device.
I am using two separate methods to achieve this and cannot replicate the success of one method while using the other:
Successful ...
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79
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Limit switch interface symmetric bandwidth on a Cisco SG300 switch
I got the job to limit the speed on a cisco 1GBit interface so that the link will have 100MBit symmetric and a burst limit of 1GBit. Its the internet uplink for a customer vlan. I am a bit confused ...
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172
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Unknown command rename on Cisco Router
I try to rename a file on a Cisco 2911 router by issuing
rename flash:/asa842-k8.bin flash:/old.bin
but get the error message
Router#rename flash:asa842-k8.bin flash:old.bin
^
% Invalid ...
- 79
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1
answer
43
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We want to see where the traffic is going on a Cisco 1140 firewall.. is there a way to do this? Need more than hitcounts [closed]
looking to see if there is a way to find out where traffic is going and coming from on a Cisco 1140 running FTD .... We need more than just a hit count...
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42
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Cisco Firepower 4110 CLI regular expression help
We have an automation, that logs into our firewalls and lists all NAT pools and the allocated connections using the show nat pool command. We want to limit the output, if possible to only show 2 or ...
- 1,732
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votes
1
answer
441
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Cisco NGFW FTD NAT/PAT pool exhaustion monitoring
We have a customer, who rarely experiences NAT/PAT pool exhaustion on their Cisco Firepower NGFW 4110. While syslog will helpfully notify us that there's an immediate problem, we would really like to ...
- 1,732
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3
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110
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DNS Servers and Host Names
I was studying how to set up DNS on a Cisco router, and I got confused on this piece that stated:
"Next step is to configure your DNS server with the host names of your local network, this way ...
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118
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Packet tracer is changing my addresses ipv4
Could someone help me with this?
I have a subnet with the ip: 172.16.193.0 in the fastethernet 0/0 of my router and when I go to put it in RIP the Packet tracer is changing it for another ip:172.16.0....
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32
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Is it possible to set maximum 32 PAT translations per global ip address?
So basically I'm trying to configure a cisco router (c7200) to use PAT with a pool of global addresses, and each global address should only support a maximum of 32 private addresses.
I've been ...
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2
answers
47
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What command would let me know Which connection links are participating VLAN 2 spanning tree?
Which connection links are participating VLAN 2 spanning tree?
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25
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Cisco business cbs110-8t-d lag spike [closed]
I bought this switch to have peace, no luck. I have 1 gbps fiber going into my main router. then I have an rj45 cat 6 wire that goes to my cisco 8 port switch. Then each port is used by an rj45 wire ...
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