Questions tagged [cisco]

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24 views

Port security Wi-Fi Access Point connected to administration VLAN

Hy everyone !! I have a technical question for a actual situation, I hope you might be shed some light on the problem. So I have a wireless AP that is connected to a Cisco Switch. The AP has an IP ...
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1answer
28 views

Catalyst 3850 password recovery

I think I may have fat fingered the username/password when setting up my Catalyst 3850. I found password recovery instructions. However when I type the command "SWITCH_DISABLE_PASSWORD_RECOVERY=0&...
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DHCP server for voice VLAN alone [closed]

I am working on the topology above in packet tracer. I want the DHCP I configured in the Voip_Router to assign IPs to the phones alone, but it seems to assign IPs meant for the phones to the WAPs and ...
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1answer
31 views

Help me understand why to decrease the MTU size

Why I should decrease MTU on interfaces instead of increase it when ipsec encapsulation is present, GRE or some other? The way I see it: a packet of 1500 bytes comes to the router, then there is IPSEC ...
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0answers
22 views

Is Device X router or switch? [closed]

Since the subnet mask is the same which is /28. We do need to do ANDing process for the question, right? My lecturer said since it's the same subnet, we have to switch but when I use the packet tracer ...
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4answers
198 views

How to add two VLANs for DHCP Pool

Currently one of my customer has DHCP pool created in Cisco Switch and ip address range is 192.168.25.0/24 (This is a VLAN). Now they have 230 devices and They are going to increase device count by ...
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0answers
24 views

BMP Server on Cisco [closed]

I'm using router Cisco 2900 series with Cisco IOS 15.4(3) M3, and there is no BMP (BGP Monitoring Protocol) configuration. What should I do? What Cisco IOS version that provide BMP?
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1answer
112 views

Traffic sent to GRE Tunnel fails, but GRE Tunnel is up and OSPF adjacencies are formed

NEW INFO_7-12-21 R1#sho ipv6 rout 2001:db8:B2:200::2:2 Routing entry for 2001:db8:B2:200::2:2/128 Known via "static", distance 1, metric 0 Route count is 1/1, share count 0 Routing ...
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1answer
76 views

Unable to disable CRC check on Cisco 2960-X

I have a 48 port Cisco 2960-X running IOS Version 15.0(2)EX5. I'm trying to connect it to a Ubiquiti EdgeRouter4 using a Ubiquiti DAC Twinax cable.. I'm aware that this is technically not recommended, ...
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1answer
58 views

How to query which line I am configuring in a Cisco router?

The Cisco router prompt shows only that I am configuring a line: config-line. How can I make IOS to print exactly which line I am configuring?
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1answer
31 views

question about local pref and ip transits

I have 3x IP Transits and 2x IXP connected to my router and absolutely we are paying more to IP Transits than IXP so I want to know what is the best local pref can I set for my outbound routes? my ...
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2answers
38 views

Cisco IOS -> ASA VTI tunnel not routing traffic

I have a VTI tunnel configured between two devices (CSR and ASAv). The tunnel comes up fine and is stable, however traffic appears to be unidirectional, from the CSR -> ASAv but not in the reverse ...
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1answer
16 views

Cisco Packet Tracer Hub IP

The problem that I'm facing has to do with the labeling above the hub's. I tried every possible hub in Packet Tracer and none of them had the configuration for IP. My guess is that the IP given is the ...
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1answer
28 views

Log messages not leaving switch after changing source to management port

I reconfigured some of our switches to add an OOB connection from the management port. The below configuration is from a 4500X, but also seeing this on 3850s and 2960s. After I did this I updated the ...
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1answer
21 views

Assigning static IP address from the DHCP pool range on Cisco 800 series

What happens if I assign a static IP address to a device in a LAN where there is an active DHCP server and the address falls within the configured DHCP pool and DHCP server is Cisco 800 Series? Most ...
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2answers
33 views

Cisco MAC ACL loop holes

I know this is not a new topic but need to clarify a couple things. I have a typical office with hosts connected to a Cisco 3560-X in same VLAN. My goal is to prevent unauthorised hosts ever accessing ...
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1answer
22 views

DSview 4 Break Sequence

one of our customers is using DSview 4 as a terminal server solution. I have the problem that I want to send a CTRL+Break to one of our routers. Unfortunately, I cannot get it to work. I tried CTRL+...
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0answers
22 views

Cisco firewall Firepower 1120 how to access global configuration mode?

Cisco firewall Firepower 1120 how to access global configuration mode? Commands enable and configure terminal are not working.
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3answers
49 views

How to make 2 diffrent networks in router ping each other

Hello i have this 2 routers how i can make them ping each other and alos the devices connected to them
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0answers
31 views

Meraki and Syslog-NG OSE [closed]

I've been struggling epically to export legible logs from my Meraki devices to a server running Syslog-NG OSE 3.30. No matter what source driver I use on the server, I see errors like this (...
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1answer
62 views

I cant ping across Lan?

Current configuration : 2695 bytes ! version 15.1 no service timestamps log datetime msec no service timestamps debug datetime msec service password-encryption ! hostname ...
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1answer
41 views

VPN/IPsec router support in Packet Tracer

I would like to know, if a router doesn't support VPN (meaning it can't be used as a VPN server) can it still route an IPsec packet? And which router I should use as a server for IPSec (AH tunnel mode)...
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1answer
32 views

CISCO PACKET TRACER “INVALID IP ADDRESS”

Hi I am still new and studying about networks have here 234.1.18.6/29 address and mask but when I try it out on Packet tracer it gets me an invalid message. I cannot understand why this address are ...
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0answers
32 views

iBGP Question reagrding Distribute - List from EIGRP

So, I have the following topology. A-B | | C-D A-B-C-D are Routers. It doesn't matter what are the IP's of the interfaces. What matters is that I have 2 loopbacks for each router. 1.1.1.1 and 11.11....
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1answer
94 views

C2960 %LINEPROTO-5 UPDOWN and %LINK-3-UPDOWN when speed is not set on 100

I have 4 ports. 3 are like this, Gi 0/1-3 switchport access vlan xxx switchport mode access power inline never speed 100 spanning-tree portfast edge One Trunk, Gi 0/8 switchport mode trunk power ...
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2answers
72 views

Are there any differences in features between Cisco ASA hardware appliance and Cisco ASAv appliance

We are planning to replace our existing hardware firewall with new virtual one. The feature that we require from the virtual firewall is as below: HTTPS decryption and logging IPS/IDS Gateway ...
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1answer
44 views

How to configure loopback for switch management

We have Cisco Switches (Nexus 93). My PC is on vxlan, in vrf "test" with default gateway 60.254. We want to use loopback 99 for managent for switches. We have created a loopback 99 with an ...
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0answers
85 views

IKEv2 between Cisco router and Google cloud VPN

Hey I'm trying to create a tunnel between cisco router and google cloud vpn (client site) but the connection is stuck on stage 2 (UP-IDLE), need help where the problem may lie. Some debug that I get ...
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0answers
24 views

Using QinQ without extra switch

I was wondering if it's possible to use QinQ to send all traffic from a switch out on one interface using a QinQ tag on all frames. What I need is to setup a wireless link between two sites using two ...
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1answer
39 views

Is this a good network configuration?

I am trying to configure ip sla for non directed link . I have configured static route to reach to non directed link 1 configured track 2 configured ip sla 3 configured access-list 4 configured NAT 5 ...
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1answer
28 views

ping shows different outputs

Both VLANS are working, and pings from R1 to R0 and vice versa also work successfully. But when I ping from the pink PCs to the blue PCs I get destination unreachable, and when I send pings from the ...
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0answers
33 views

Eigrp flapping while using natting with route map

I have configured a topology which contains ip sla , route map , dual natting.It work perfect but when I used route map natting the eigrp become flapping and show the error is "retry limit ...
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1answer
75 views

Unknown cause of disappearing CAM table entry and unicast flooding

Posting this in response to the closed question: Network flooding without ff-ff-ff-ff-ff-ff (layer 2 broadcast) MAC address in destination? I have a network that is experiencing the following problem: ...
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1answer
22 views

IP_PHONE_POWER_ADAPTER IN CISCO PACKET TRACER FOR MAC

I'm using Cisco Packet Tracer v8.0.0 for Mac, and I'm having trouble connecting the ip_phone_power_adapter module of the "7960 ip phone" device. According to several tutorials, you just drag ...
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2answers
28 views

Write command for only saving the config to power memory

I'm confused on what command to use on a cisco switch where if the power is unplugged from the switch, I lose the configuration I saved and it reverts back to the previous config. I've been ...
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1answer
20 views

IP Source Guard On Static Networks

I am running a set of Cisco C9300s. I have them configured with ip dhcp snooping, and ip arp inspection with ip dhcp snooping trust and ip arp inspection trust set on the fiber link between the 2 ...
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0answers
16 views

Cisco Kron Job starts later and later

I use a Kron job to ring a shit bell for our manufacturing plant. The application works, but the job starts 35+ seconds late. The problem seems to be getting worse, a few days ago it was at 35 secs ...
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2answers
43 views

How to isolate in VRF clients with public IPs in MPLS ISP network

I have OSPF and MPLS enabled in network and run xconnects to transmit L2 traffic. But also have just Internet clients that want public IP addresses. So I configure public IP on interface towards ...
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1answer
46 views

Network flooding without ff-ff-ff-ff-ff-ff (layer 2 broadcast) MAC address in destination? [closed]

It appears that a switch is sending the same traffic to all ports in a VLAN: In a Wireshark capture on host 192.168.0.10 with MAC aaaa.aaaa.aaaa I see packets with MAC destination bbbb.bbbb.bbbb and ...
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2answers
53 views

How do layer-2 devices (bridges/switches) join a multicast MAC address?

I was going through the IEEE 802.1Q (2018) standard on my own. The standard speaks about group addresses, and how these group addresses are learned by transit bridges, which is all fine. But how do ...
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0answers
12 views

InterVLAN routing on Cisco router with multiple trunks [duplicate]

I recently came across a scenario where I wanted to (ab)use a Cisco router (ISR 4331) as a layer 3 switch. The router is directly connected to two switches. The connection between each switch and the ...
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1answer
41 views

VLANS trunks doesn't work

Switch0 configuration: S0(config)# vlan 10 S0(config-vlan)# name dev S0(config-vlan)# vlan 20 S0(config-vlan)# name tech S0(config-vlan)# exit S0(config)# interface f0/1 S0(config-if)# switchport mode ...
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1answer
31 views

In France , what language is the Cisco IOS for routers and switches?

If I accept a Network Engineer job in France, what language will the Cisco , Juniper, etc, IOS communicate in? If it is in French, is there an acceptable workaround that I can install in routers that ...
5
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1answer
55 views

sFlow configuration tcam question for Cisco Nexus 9396PX platform

I am trying to configure sflow on Nexus 9396PX switch and having some difficulty to understand tcam region. hardware access-list tcam region span-sflow 256 ! feature sflow sflow counter-poll-interval ...
3
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1answer
87 views

What does it mean when default route is to a network address?

The default route as configured in a Cisco router is as shown below: Gateway of last resort is 103.0.0.0 to network 0.0.0.0 What I have came across so far is that the gateway of last resort is ...
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1answer
68 views

DHCP Help 3560-CX + Aruba AP515

The problem VLAN 100 is not assigning IP address to the SSID Guest from the AP, but Aruba is Tagging the SSID to be VLAN 100. How do I get the Switch to assign the DHCP? On the switch, it seems to ...
2
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1answer
53 views

Difference beetween MTU, ipv4 MTU and mpls MTU

In a Cisco configuration, what is the difference beetween the MTU, ipv4 MTU and the MTU configured into the mpls section of an interface ? interface X mtu 9214 ipv4 mtu 9180 [...] mpls mtu 9200 !...
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1answer
67 views

BGP route advertised but cannot Ping

I have this rather basic setup with 3 routers running BGP, each has Loopback int configured. Is there an extra step required for R2 to ping R4 Loopback interface despite it's being advertised? R2#sh ...
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1answer
35 views

vPC between Cisco nexus 9236C and 9336C

I have a Nexus N9K-C9236C and I would like to add an other one to have redundancy with vPC fonctionnality (like describe here). The point is my suppliers don't sell this model anymore because it has ...
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1answer
54 views

Cisco IOS traffic thru VRF

I know, VRFs are meant to create a seperation on layer3. There are certain ways to "break" thru a vrf in a sense with things like: Tunnel interfaces IP helper NetFlow But is there a way ...

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