Questions tagged [cisco-ios]
For discussion about Cisco's Internetwork Operating System - Cisco IOS
488
questions
1
vote
1answer
25 views
What is the difference between trustpool and trustpoint on Cisco IOS?
On Cisco IOS, there is trustpool and there is trustpoint. I have seen imported certificates in either of the two. And it seems SSL connection works when either location has the certificate it needs. ...
0
votes
0answers
22 views
What is OID for switch chassis global MAC address?
when issuing the command show chassis on ICX7750, it shows the MAC address of the switch, I am trying to find the SNMP OID for this entry on the switch, I have already found ifPhysAddress, but this is ...
0
votes
2answers
51 views
Cisco Switch without VLAN support?
I've been reading about VLAN and wondering is there any Cisco Switches that do not support VLAN?
So far, all switches that I found do support VLAN. This is one of the example in my lab.
Cisco-Switch-...
0
votes
0answers
19 views
Cisco Guestshell - Bridging of VirtualPortGroup0
i'm fiddling around with ne virtual-services functions of IOS-XE.
Is there a possibility to bring interface "VirtualPortGroup0" into a bridge domain with some physical interface of the router?
It's ...
0
votes
2answers
36 views
Why doesn't kernel itself had entire L2/L3 protocol stack? [closed]
I know kernel itself handles protocols in layer 2, layer3 and layer 4 at ipv4 stack, but why can't kernel itself doesn't have protocols such as STP/RSTP/xSTP/OSPF...etc, implemented.
Why should we ...
1
vote
1answer
58 views
TCP handshake immediately RST [closed]
I'm trying to set up a modbus TCP connection on port 502 but get a RST packet immediatly. So the TCP connection handshake doesn't even succeed.
This is done on a windows machine on an ESX server.
The ...
1
vote
1answer
50 views
Filter tagged route to downstream routers
I'd like to filter a redistributed route from EIGRP into OSPF to all routers in AREA2 and AREA34. I have tagged the route 10.90.100.0/24 with tag 90 at the Tampa router where its redistributed into ...
0
votes
1answer
46 views
Cisco Zone Based Firewall
I have Cisco 891F configured with ZBF from CBAC. Right now, router is wide-open SSH/443 or anything my public address is listening on, which is not what I intended. My intention was to only allow IMCP ...
0
votes
1answer
21 views
WebAuth With RADIUS For Switch Web Portal
I have a Cisco IE4000 running IOS 15.2. I am trying to login with my RADIUS credentials to the web portal for the switch. Currently the RADIUS is configured for successful login to Console and SSL but ...
0
votes
1answer
41 views
DHCP when you have both layer 3 and switch ports
I have the following config:
ip dhcp pool Vlan10
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
interface GigabitEthernet0/0
!
interface GigabitEthernet0/0.10
encapsulation ...
1
vote
0answers
64 views
HTTPS QOS and policing [closed]
In our office, everything runs on HTTPS. We have softphones and web-based clients which are high priority. We also have Google search, maps and other low priority websites that should work on best-...
0
votes
0answers
53 views
cisco zone-based policy firewall
How to limit the number of established connections for each host, that connect to the service? In the policy settings, I found only blocking by the number of half open connections.
parameter-map type ...
1
vote
2answers
96 views
Restricting TFTP access from Host to Router using extended ACL in Cisco IOS
I am trying the below Extended ACLs to restrict TFTP but still I am able to upload files to the router using tftp. Not sure, what is wrong, can you all help?
Approach 1:
permit udp host <ip> ...
0
votes
2answers
77 views
What does the Cisco HTTP client (help to) do on a switch?
While checking for vulnerabilities in one of our Cisco switches I came upon this: CVE-2019-12665.
Excerpt from the CVE:
A vulnerability in the HTTP client feature of Cisco IOS and IOS XE Software ...
0
votes
1answer
40 views
implementing broadcast traffic restriction
Can we restrict the high broadcast traffic from interface in Cisco ASR9k and 7600 routers? If so, what configuration we should apply?
0
votes
0answers
15 views
Cisco 7960 CTL File Encoding
When booting my 7960 phone, I am getting all of the correct files. However, in trust list (CTL File), the IP addresses are incorrect. They are the ASCII characters of the actual IP address. Therefore, ...
3
votes
1answer
113 views
Moving from 12.x IOS to 15.x IOS - Cisco 3750G
Is there any issue with jumping from IOS version 12.2(35)SE5 to 15.0.2-SE11 on a Cisco WS-C3750G-48PS-S switch?
Should I upgrade to the latest 12.x first (12.2.55-SE12), and then move to the 15.x ...
2
votes
2answers
73 views
How to ping from PC on EIGRP area to PC on OSPF area without middle router?
This is my topology.
And I can send a package to every router and PC within the colored area, how can I ping from a PC on EIGRP area to a PC on the OSPF area? I heard about default route but I saw it ...
0
votes
0answers
51 views
Prioritizing SSH, Telnet, TACACS in Cisco IOS
For Prioritizing SSH, Telnet, TACACS locally generated traffic on Cisco ASR running IOS XR, we have:
ssh server dscp 48
tacacs-server ipv4 dscp 48
Need the same for cisco GSR: 12416/PRP running IOS. ...
0
votes
1answer
48 views
Cisco IOS RA VPN with internal NAT
We have a Cisco 871 setup with a remote access VPN which works fine. However we now need the RA-VPN to be able to access an IP on the LAN which only speaks with an authorised subnet. IP addresses as ...
0
votes
0answers
70 views
I'm unable to see packet drops after configuration of QoS policy
I aim to send iperf traffic from Endpoint1(Client) to Endpoint2 (Server) with the following SR path = {R1, R2, R3, R4, R3, R2, R1, R2, and R3}.
First of all, the traffic generated by iperf from ...
2
votes
0answers
66 views
C2960 - Memory has insufficient capacity [closed]
Please, do you know if there is any way on how to release more processor memory from a C2960 switch without restarting it?
I am receiving an insufficient memory alarm from this switch. I noticed that ...
1
vote
0answers
25 views
Loopback on T1 not showing up [closed]
I'm a T1 tech for a major US ISP. We regularly remotely loopback T1s (at the smartjack) and test them before the installation. Recently I got 3 new T1s in a bundle that acted weird, and I hoping you ...
1
vote
1answer
75 views
Cisco 860 Disconnecting on WAN port every 30 minutes
I'm completely stuck for solution to this issue. My ISP logs show my Cisco 860 router disconnecting and reconnecting every 30 minutes and 18 seconds all day - it's noticable when browsing as the site ...
0
votes
0answers
67 views
Cisco 1841 stuck on boot?
I found an old Cisco 1841 router and decided to boot it up to play with it a little. Everything seemed to be going ok but I guess something interrupted the boot.
Last line is
%SYS-6-...
0
votes
2answers
305 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 ...
0
votes
1answer
108 views
How to set vlan QoS priority for voip (on cisco 2960)?
I have assigned all voip-related ports to one vlan. I want to set up the QoS priority for that vlan. Which commands can help and in which mode?
I have assigned all required ports to one vlan. I tries ...
0
votes
2answers
62 views
Multiple 802.1x clients, single port support on a Cisco 3750 switch?
I'm thinking of using our Cisco 3750 switch with our RADIUS server for 802.1x authentication on our Ethernet ports.
If I enable 802.1x and a user connects a switch to their Ethernet jack, and the ...
0
votes
0answers
41 views
What spanning tree IEEE protocol does the Cisco 1252AG Aironet access point support?
Link to data sheet
We're running Cisco IOS version 15.2(2)JA1. What version of the IEEE STP is supported on the Cisco Aironet 1252AG access points? We are using the "bridge X protocol ieee" command.
...
1
vote
1answer
116 views
Understanding Throughput of interfaces problem on Cisco Routers
I have the following topology set on AWS where there are 4 CSR 1000v Routers deployed and Segment Routing enabled in which the Segment Routing Headend is R1 and the destination is R3.
I aim to send ...
1
vote
1answer
40 views
Difference Between PAT with pool or Interface/Loopback?
I'm just wondering what difference does it make when doing PAT with same IP defined in pool or assigning IP on Loopback and overloading that interface.
ip nat pool MYPOOL 1.1.1.1 1.1.1.1 netmask 255....
4
votes
1answer
177 views
Switch updating - Cisco Prime
I'm tasked with mass updating of our Cisco switches via Cisco Prime. Is it possible for the update to fail? Can the switch 'hang' in reboot loop? What if I tell Cisco prime to backup running image?
...
3
votes
2answers
97 views
Decreasing SNMP update timer on IOS-XR (CISCO ASR)
I've a case where i'm trying to poll SNMP information every 10 seconds from a Cisco IOS-XR devices (interfaces mib). Seems like CISCO IOS-XR updates SNMP information every 15secs, so sometimes ...
4
votes
0answers
71 views
Redundant physical interfaces for Cisco pseudowire-class
I have a link which is LT2P from a site router R1 (Cisco 867-VAE, IOS 15.3) which has two external interfaces defined (dialer1 and vlan-1000), but only one plugged in (first is ADSL, second is ...
2
votes
2answers
59 views
Suppress CLI terminal output on IOS
I would like to know if we can suppress certain lines from being displayed on the CLI. Example: I call following TCL script, that in itself calls some other scripts. What i Get on the screen is this:
...
3
votes
1answer
57 views
Finding MAC address with OUI List
I'm in the process of labeling the interfaces of my Cisco 3750G with descriptions referencing the device type that is associated with that port.
I understand that I am able to run a show mac address-...
1
vote
0answers
145 views
Routes stopped redistributing through OSPF [closed]
I was entering a number of secondary addresses on some VLANs. In total there were 10 secondary addresses added.
The subnets added were from three publically routable /24s (I will call them 25.0/24, ...
3
votes
2answers
57 views
Firmware Compatibility with 15.x IOS versions
I have a Cisco switch stack with both PoE and non-PoE switches as members. Is there any compatibility issues with the firmware version 15.0.2-SE11 between the following devices?
1x Cisco WS-C3750G-...
4
votes
1answer
555 views
Working with Cisco IOS.sh and grep
I just learned about Cisco IOS.sh and found that you're able to run commands similar to UNIX based systems on Cisco devices.
First question: Is IOS.sh router or switch specific? Or are they able to ...
1
vote
1answer
244 views
Cisco IOS Version changes for SNMPv3 server-group context
I'm trying to understand switch mapping using SNMPv3. It's come to my attention that the group(user) who is authenticating needs access to thecontext
for mapping out VLANs. I've figures out this can ...
1
vote
2answers
296 views
CISCO ISE COmpactibility with 2960 Switch
I Was checking the switches which are compatible with Cisco ISE solution, from their site i saw that they support Catalyst 2960-S but in my environment i have 2960-24TC-S, I would like to know what if ...
3
votes
3answers
574 views
HTML folder located within IOS Image file?
I have two 3750G switches in a Cisco switchstack
I wasn't sure if this was common at one point or not, but when I go to copy a new IOS image .bin onto flash, It is showing not enough space. Upon ...
4
votes
1answer
220 views
Cisco APIC command equivalent to Cisco IOS `show terminal | include Length`
Whenever I run show running-config leaf/spine from APIC, I notice that there is a pause which is --More-- at the end of the first page.
What I'm trying to achieve is to disable that so that I can ...
2
votes
1answer
218 views
What do I need and where to setup 2 VLANs with a Cisco router 1100 series with a wifi AP Aironet 1300 series
I am struggling and I don't really know what I need to setup my network.
I have a Cisco router C1111-8p (8 switch ports) and a wifi AP C1832.
+---------------+
+---------...
3
votes
1answer
481 views
How to setup a WAN port in Cisco ISR 1111?
The C1111-8p has 2 WAN ports and 8 switch ports. I am trying to set up the WAN port to an optical fiber modem, the ISP provided:
IP address
Mask
Gateway
DNS1 and DN2
I need to set up the port GE 0/0/...
7
votes
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
votes
2answers
179 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
82 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, ...
3
votes
2answers
95 views
Client timeout for Cisco IOS Static DHCP Pool
I'm not a network admin, but I have an old Cisco Catalyst 3560 for my network. I've successfully set up a DHCP Pool:
ip dhcp pool 192.168.0.0
network 192.168.0.0 255.255.255.0
default-router 192....
0
votes
3answers
90 views
Switch syntax, vlanXX and vlan [space] XX
How does a switch OS know that this is the same syntax? There are certain commands where you might reference the vlan like so "switchport access vlan 35", (a space between vlan and the number) and ...
