Questions tagged [cisco]

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Force Packet thru different VRF with route-map

I am working on a LTE backup configuration. I would like to have the cellular connection open constantly and establish a VPN connection even before a failure on the wired internet line occurs. This ...
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1answer
177 views

Cellular interface in VRF (LTE)

We are testing an LTE configuration with a Cisco C1113-8PLTEEA router. We already have a wired internet connection in a specific VRF called DSL. As far as i understand the LTE backup, we do have to ...
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How to change PC name on Packet Tracer 7.3 without config menu

Is there any alternative besides going to config and changing it there? Also need for generic server.
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35 views

2 Routers, 2 Internet Connections, 2 Subnets - 1 Link?

I worked something out in my head, but I am having a hard time putting this into practice. We own 2 units, both within 100m of each other. Both units have internet connectivity, but there is a single ...
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1answer
156 views

EVPN VxLAN arp suppression TCAM carving

Deploying Clos design network using leaf Cisco Nexus 9396PX and when trying to configure arp-suppression using tcam carving getting this error Free up tcam slice from VACL (default vacl tcam is 512) # ...
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1answer
54 views

Cisco FL-4330 Backplane Performance

We are using a Cisco FL-4330 for the first time. Our application requires Gbit throughput in one vlan. According to the specification sheet, the Cisco FL-4330 only supports 100mbit in the backplane. ...
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4answers
1k views

Difference between SVI and subinterface

Modern multi-layer switches seem to support both SVIs (switch virtual interfaces) and subinterfaces concepts. Both are virtual layer 3 concepts used to perform routing functions and some equipment ...
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1answer
66 views

IPCP removing default route when 2 available

I've been stuck on this one in my lab for a while. Any help is appreciated. Here's my CPE edge topology: https://i.imgur.com/UZ4u0XG.png Take the below scenario: I have 2 circuits coming in that I am ...
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2answers
1k views

Why does the CISCO's command 'enable secret <password>' produce different hash from MD5?

I am configuring a CISCO's 4331 router password, in Packet Tracer. More specifically I use the command enable secret weakpassword. This command uses by default MD5 to hash the last string (i.e ...
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73 views

Cisco ASA 5516-X Wont communicate on inside interface at all. No packets

I'm configuring a brand new ASA and the Firewall refuses to communicate on my inside interface. No matter the traffic type, its denied by implicit deny every time. I was hoping to get some feedback/...
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56 views

Confusing Cisco enable password format

I'm totally confused by this Cisco password format: enable password level 15 encrypted 382fda4a4a26e6637edac0eb8b8ba4581087d32d Overall string is 40 bytes long: $ echo -n ...
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2answers
197 views

Is it possible to filter directly connected networks redistribute with BGP based on a peer basis?

Assume a simplified case in which router R1 is connected to two BGP peers: one eBGP peer and one iBGP peer. Is there a possibility to advertise directly connected routes only to one of them ...
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Cisco IOS XR RPF filter bug?

Based on this documentation: https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/security/62x/b-system-security-cg-ncs5500-62x/b-system-security-cg-ncs5500-62x_chapter_01001.html I'm trying to set up ...
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9 views

Cisco RV345P - disable DNS names for DHCP bindings

This is about Cisco RV345P router (non-IOS, it's the Web interface kind). When the hosts on our office LAN obtain address from DHCP their host name is automatically registered in a local DNS resolver ...
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1answer
35 views

Accessing an interface range that spans beyond one stack on a Cisco Switch

I want to configure Interfaces 0/3, 1/2 and 1/3 for example. Using interface range gig 0/3-1/3 did not work, is it simply not possible or is there a different syntax? EDIT: Of course aside using ...
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4answers
98 views

Cisco N9K - Down an interface in response to another interface going down?

I currently have my transit providers plugged directly into my router. I really like this arrangement because when the ISP goes down this typically downs the interfaces which results in BGP peering ...
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116 views

Cisco ASA 5585-x Failover Virtual MAC address

I have configured Cisco ASA 5585-x with Active/Standby mode, cisco best practice saying you should use Virtual MAC address on interface to avoid traffic disruption when you do failover. now question ...
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3answers
70 views

Console via AUX

I'm reading this article: https://www.ciscozine.com/access-to-the-console-via-aux-port/ I don't understand why they use an IP address? What if the router doesn't have an IP address? What if the router ...
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1answer
96 views

Duplicated Vlan ID

I have one flat network with our data center and it is causing as a lot of issues, so i had to design a new network to separate the buildings from the data center, when I designed the new network i ...
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22 views

Cisco ASA NSEL Template IDs 256-271: Is there a list of names and functions? [closed]

I am trying to interpret Cisco ASA NSEL data, which I understand is similar to Netflow v9 but uses biflow records along with static data templates. I see data templates 256-271 in template frames, and ...
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24 views

Windows L2TP VPN issues when accessing Site to Site VPN on Cisco 5506

We have two Site to Site VPNs and Remote Access VPN configured. Using the builtin IPsec client on OSX all subnets are accessible however when using L2TP built in client on Windows 10 ICMP traffic ...
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2answers
77 views

Cisco Port forward ip nat inside source static … Invalid

This is almost the same question as How to setup port forwarding on Cisco Router running Version 15.2(4)M6. The problem is that the command used in the answer is not available: ip nat inside source ...
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147 views

Dual WAN with each ISP in a VRF - Cisco IOS

I have a DMVPN spoke router setup almost identically to the spoke configuration listed here (Also quoted below): https://www.cisco.com/c/en/us/support/docs/security-vpn/dynamic-multi-point-vpn-dmvpn/...
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1answer
51 views

questions on nexus 3064

In most of times i have worked with Juniper switches but in some cases i should use some Nexus 3064PX series(48x sfp+) so i have some questions : as i remembered some switches such as 3750 has some ...
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70 views

CCNA No Longer Required?

Is it true that anyone can go straight and take the CCNP exams (Switch, Route & TShoot) now without passing CCNA first?
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1answer
33 views

Unstable network performance within the same facility

Asked this question previously, but it wasn't as detailed as this. I had my network speed improved by my ISP, I tested the network speed from the Fiber media converter, the speed was awesome, tested ...
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17 views

Multicasting with Layer 3 Switches [duplicate]

I was wondering if someone could advise on this please - I want to set up multicasting on a network of layer 3 switches. So I understand I should enable ip igmp snooping on all the switches and then I ...
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1answer
43 views

Much ARP requests from Cisco ASA 5510

An employee of the ISP writes to me that a lot of ARP requests from us go to them. ISP equipment log: 07:47:27.732242 ARP, Request who-has AAA.BBB.CCC.213 tell AAA.BBB.CCC.53, length 46 07:47:27....
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2answers
184 views

Cisco BDI not Forwarding L2 Traffic?

I'm new to interface bridging, and I have an ISR4431 running 03.16.04b.S on which I need to bridge between two interfaces for two hosts: One interface is connecting directly to a host, the other to a ...
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30 views

Site to Site VPN between Cisco ASA and Aruba Virtual Gateway

We have hosted an Aruba Virtual Gateway on AWS. All the configurations are done as per the documentation of Aruba VPNC. Through AWS security policies, UDP 4500 is open on AWS side. We want to ...
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1answer
81 views

Can modern network equipment handle very large broadcast domains

We operate a network where we have 'tons' of VM servers that are physically hosted on many many blade chassis. The thought behind the original design was to simply put them in one very large ...
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52 views

Does Cisco vManage support SSH to a device over an HTTP API?

I have found /newssh/connection/<IP> in Cisco's NMS administration section, but except for the GUI part (vManage's /shell/<uuid>) I haven't found a direct way to run a command on a Cisco ...
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36 views

Allow one way SSH on extended IP access list on Cisco switch

interface GigabitEthernet1/0/11 ip access-group VM01-BLOCK-SSH-ACCESS-OUT out objective: 10.10.10.104 -x-> any 10.10.10.0/24 via SSH any 10.10.10.0/24 via SSH ---> 10.10.10.104 Question: ...
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2answers
58 views

NATTing a server address

I need help writing NAT rule for this use case: I want to be able to connect to an local IP as though it's the remote server IP. e.g. port forwarding. I don't have access to the firewall on the remote ...
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1answer
65 views

Suspect MTR showing incorrect packet loss through router; other tools are not showing loss

Using MTR (sending TCP with or without SYN), I'm consistently seeing packet loss on one intermediate router in the path. UDP does the same. I'm use TCP to avoid the ICMP packet flood limits set. I ...
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2answers
52 views

how to move configuration from one Nexus interface to another?

I am doing some cleanup on a Nexus switch I have (3048) and was wondering if there was an easy way to copy or move a configuration from one interface to another? When I move an existing connection to ...
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2answers
100 views

Cisco Router on a Stick IP Addressing

I have been running into IP addressing problems with my Packet Tracer network and VLAN assingments. I have 2 switches connected to a router, 1 switch has 4 VLAN's and the other has 3 VLAN's I can't ...
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1answer
95 views

Why there's no “show vlan” command on my Cisco NCS-5001?

I'm trying to learn my way around Cisco switches by watching an online course [1] and trying the commands from there on a switch I have access to. One of the first commands I've tried, show vlan ...
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1answer
116 views

Cisco L2 switch port ACL options

I'm trying to understand Cisco Switch ACL options I can potentially use to limit traffic. Switch is a IE2000 series with Lanbase IOS. It is L2, with trunk port to uplink switches, multiple VLANs on ...
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1answer
52 views

Routing failed after define static route on core switch

Current connection path: 10.40.20.0/24 desktop <-> access switch <-> core switch <-> 10.30.15.33 NAT firewall for internet access Objective: adding additional path as following to ...
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2answers
43 views

Setup IPSEC in Hub/Spoke fashion

I'm trying to setup IPSEC tunnels in a hub/spoke type fashion. I've emulated this in GNS3 by creating three sites. Each site uses an IOSv router as it's WAN router. I'm using site 2 as the hub and ...
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243 views

AS920 Serial console pinout

some genius at Cisco decided that i would be a good idea to implement the serial console port (usually a RJ45 or DB9 connector) as USB-A connector. :-( I have some of these boxes implemented in fiber ...
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1answer
153 views

Cisco NAT - Overload PAT and Static nat from one inside to two outside interfaces

i have following setup Cisco ISR4k Router with one inside LAN interface and two outside Interfaces. ---- WAN1 (NAT outside) LAN (NAT inside) -- ISR4k | ...
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2answers
152 views

Migrate from Cisco HSRP gateway to Juniper VRRP Gateway

We have a pair of Cisco Nexus 3548 switches setup with HSRP acting as the network gateway for each of our network segments in a datacenter/VMware environment. We wish to replace the Cisco Nexus ...
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43 views

Cisco ntp clients won't synchronize with ntp master if there is an ACL

I have configured my Cisco router as ntp master. My branch offices' routers are ntp clients. Everything works OK until I apply access-list on my ntp master. If I apply ACL on my ntp master, ntp ...
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2answers
155 views

How does a router decide what route to forward a packet when routes come from different routing protocols?

I'm a little confused. I know how the best route makes it to the routing table, but what process does the router follow to choose a path to forward a packet if, for example, you have something like ...
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1answer
666 views

Destination NAT on Cisco ISR

I know how to perform regular overload PAT in my lab running sh ver Cisco IOS XE Software, Version 16.03.09 Cisco IOS Software [Denali], ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 16.3.9, ...
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1answer
72 views

ssh from cisco with fake source-ip

I have two cisco devices directly connected. router1 = 10.70.223.96/31 router2 = 10.70.223.97/31 on router2 there is an admin ACL permit 10.64.95.0 0.0.0.255 so I can't only SSH router2 from that ...
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1answer
79 views

BGP Authentication Key-Chain Between Cisco IOS XE L3 Switch (c9300-24S) and Juniper MX480 Router

Need to create a BGP authentication keychain between Cisco and Juniper devices. Need assistance with config commands for Cisco 9300-24S.
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142 views

Cisco ASA 5506: Adding two public IP's that are on the same subnet for the primary and backup interface

Im programming a Cisco ASA 5506. I need to add a primary (public) IP that is x.x.x.82/24 and a backup IP that is x.x.x.81/24. The ASA wont allow me to do this as it gives me an error: "the IP ...

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