Questions tagged [cisco]

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14 views

How to export a device configuaration in Gns3

I have A Gns3 topology and i try to save my configurations to a txt file in my desktop. I tried the [Tools] > [Import/Export node config] in the menu,[Export configs to a directory] but it only ...
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41 views

TRex Warning : number of rx packets exceeds 101% of tx packets!

+------------+ | | +------------| tester |<-------------+ | | | | | ...
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Cisco Packet Tracer gives "Invalid IP Address" when I assign an address to a router [duplicate]

I was given an exercise where I have an IP address range and I have to configure multiple sub networks from that range. The address is 238.61.192.128 with the mask 255.255.255.128 (/25). I created my ...
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Cisco L2TP VPNd with GRE over IPsec tunnel [closed]

I have a GRE over IPsec tunnel between router 1 and router 2. The routing between the 2 routers is EIGRP. I have access to the CLI and I can ping all subnets. I try to create VPNd L2TP I create it, ...
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1answer
44 views

EtherChannel ports standalone after restarting packet tracer

I got two L3 switches (Cisco 3560) with no switcport ports connected to L2 switch (Cisco 2960). It used to work, but when I saved and restarted Packet Tracer -- all ports went into standalone mode. ...
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129 views

STP convergence process needs detailed explanation, please

So, I understand how STP convergence works on high-level. However, when I am trying to look into the process deeper, I run across some doubts I would appreciate someone could clarify to me. Here we go:...
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1answer
37 views

HSRP switching active state but destination is unreachable

I've been working on a this network where I have 2 routers, Main router and failover router. both routers are connected to the main switch via fa0/0 which is divided into 3 sub interfaces, fa0/0.10, ...
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Cisco C9300 Drop Out And VLAN Table Loss

I have a Cisco C9300 is one of my main racks. Recently it has been restarting on it's own. My suspicion that the PSU is on the way out. Strange part is when it does this the VLAN table resets to ...
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221 views

Passive interface default - issue

I was trying to configure ospf router, I have a router connected to FW in G1/0/10 and mpls router connected g1/0/1, when i typed passive interface default in the ospf router i lost all connectivity ...
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25 views

Switch Port channel down but firewall did not log the port down event

Can some one help me here if I am missing anything to check. Issue: Our Palo Firewall got a vwire configured with interfaces eth1/5 & eth1/6. eth1/5 is directly connected to eth1/2 of cisco switch ...
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90 views

Cisco 9300 Software upgrade without automatic reload

Is there a way to upgrade a Cisco Catalyst 9300 switch to a new software version without the switch automatically reloading as part of the initial install process? With other switches (eg Cisco ...
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1answer
53 views

Cisco Packer Tracer port labels all jumbled and covering each other

Has anyone found a solution to make this look cleaner and more readable. I spend hours moving around the devices trying to figure out which interface is connected to which router and make so many ...
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1answer
43 views

Nexus Management VRF on same VLAN as LAN switches

1 Hi All. I searched this question but I'm not finding anything relevant, or I'm not understanding the results properly. I have all my L2 switches remote management access, SSH/SFTP, configured on a ...
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Problem with bgp aggregate-address behavior in iOS when a large number of OSPF routes update all at once

We have a direct connect setup to AWS using BGP. We are running a ISR4451 with IOS XE 16.03.06. I have a strange situation where the AWS BGP neighbor drops our connection with the notification: ...
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1answer
93 views

AAA Authorization on IOS

Still working away on a project (not for real life deployment so don't worry about seeing passwords). I have a Tacacs server set up for centralised AAA. I am trying to set up two users, "admin&...
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65 views

Access TACACS+ Server through ASA

I am trying to set up TACACS+ for a project. The below image shows the layout of the network. So far I have the TACACS+ server set up and working (HQ_AAA_SERVER) and it works fine for authentication ...
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Cisco 2960 and Cisco 871 - no connectivity on non-default vlans

Unable to get internet connectivity from non-default vlans. Suspect router config is not adequate Five vlans created on 2960 (10,20,30,40,50)and Gig port 0/1 set to trunk. Port f0 on router which is ...
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29 views

Active Peer [my FTD IP] already exists

I have configured the Cisco FTD and FMC, now I am trying to add the FTD Device to FMC but the system shows me such an error. Active Peer [my FTD IP] already exists and the the FTD Device doesn't ...
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1answer
58 views

Cisco ASA Clientless SSL VPN Apply Tunnel Group

I'm trying to implement the answer from a previous question I've asked (Cisco ASA Clientless SSL VPN Restrict Network Access) My ultimate aim is to set up an SSL VPN on a Cisco ASA device to allow ...
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25 views

How many queues are available for fair-queueing on ISR1k

I am working on a QoS configuration on a Cisco ISR1000 device with Firmware Version IOS-XE 16.12.04. I enabled fair-queueing on an interface and the command to set the number of queues is not ...
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43 views

How can I do ERSPAN on Cisco Nexus 9000 for VLAN serment?

I need to capture traffic in local VLAN on Nexus9000K, start wireshark on my laptop, ip address of this laptoop is 9.9.9.9. Also I want to capture only icmp and src host 10.0.0.0/24. I try to do this: ...
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1answer
53 views

Cisco ASA Clientless SSL VPN Restrict Network Access

I'm working on a Uni project to set up a secure network. One aspect is to have a VPN for clients of the imaginary company to access web based services. I have set up a simple clientless SSL VPN which ...
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820 views

Different Behaviour of a Router

There are 2 cases that I would like to point out: When the router is directly connected with 2 PCs like this, In this case, PC2 is able to ping PC3. I just configured the IP address of PC2 and PC3 ...
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79 views

Is this network configuration possible with Layer 3 switch and ISP routers?

If possible I would like to use a Cisco SF350-24 Layer 3 switch to enable the below network layout. In our office we have 2 internet connections we often use for testing that require an internet ...
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99 views

HSRP on multilayer switch not working

I have this network topology in Packet Tracer, and i wanted to implement HSRP on both of the multilayer switches. So what i made here is the switch on the left, both the laptop and the server are on ...
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55 views

SFP not working on new switch

Switch: Cisco 2960G 24x 1G ports and 4x 10G SFP SFP fiber module: 10Gtek AXS13-192-10 NIC: Solarflare SFN7122F I got a new to me switch, after resetting to factory defaults I got it all configured for ...
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1answer
46 views

Cisco SD-WAN Cloud OnRamp Configuration

I'm configuring a user per the instructions https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/cloudonramp/ios-xe-17/cloud-onramp-book-xe/cloud-onramp-multi-cloud.html#...
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25 views

Using PBR or similar for an IP SLA for a C1111-8P-TLELA with a dynamic Cellular WAN IP

I am trying to get 4G Failover working on a Cisco C1111-8P-LTELA router. I have a known working solution that I usually use with IP SLA, and a local PBR route-map that forces traffic out of the ...
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312 views

Cisco Forwarding ASIC Buffer failure

We have Cisco fex Switches which connect to 5696 and we see this errors on them. "forwarding ASIC Buffer failure" Do you have any Experiences ?
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2answers
42 views

events log in cisco

Is there log file just like events file in windows showing what happened,who did what, kind of ? I could not see with show archive log.some switch goes down and support guys plug off/on cisco switch, ...
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1answer
81 views

Cisco ASA syslog messages, reversed source and destination for outbound communication?

I'm writing my own parser for transforming the syslog output from the ASA firewall into CSV for deeper analysis. What I don't get, is why the "for" and "to" machines are switched ...
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1answer
40 views

Access and Trunk Port [duplicate]

I have an access port that I'm trying to change to a trunk port. So, while I'm on the interface I want to change and do: switchport mode trunk switchport trunk allowed vlan x a show run command then ...
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1answer
66 views

can't ping the WAN IP of a router

I learned to use cisco packet tracer and found something confusing but actually this is not about the cisco packet tracer . I'm curious if this apply in real network as well. So i tried building this ...
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1answer
83 views

Why does only the root bridge send RSTP BPDUs after sync?

From a recent packet capture, after the sync process in RSTP, only the root bridge sends RSTP BPDUs every 'hello' interval. Why is it so? Shouldn't all switches send BPDUs every 'hello' interval since ...
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57 views

Why does RSTP send proposal bit and agreement bit as '1' initially?

From a recent Wireshark capture of a RSTP BPDU on a switch, both proposal and agreement bits were set to '1'. In my understanding, initially both switches 'propose' themselves as root. The better root ...
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29 views

HOW to FC SAN cord compatibility? Cisco FC switch (DS-X9448-768K9) and HP Proliant servers (360 g6, g7, 380 g8), with HP SN1100E 16Gbps HBA

I have obtained a couple of Cisco Fibre Channel switches (DS-X9448-768K9) in the 9700 MDS, which this being my first foray into constructing a SAN with a ZFS FreeBSD server, which I have ebay 'good ...
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34 views

Route-map to manipulate metric in EIGRP

I have following Setup R1 --- R2 --- R3 --- R4 --- R5 The same network is being advertised from R1 and R5. There is some difference in delay between the two paths R1-R2 and R4-R5. So the route from R1 ...
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24 views

Can we use cisco MDS 9700 without Fabric Module

We have Cisco MDS 9710 and we want turn it on with 1 I/O module. Is it mandatory to install Fabric Module for it? My question is , Does MDS 9700 works without Fabric Module or no? Thanks,
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36 views

Static NAT and PAT simultaneously for single real host IP?

currently I have in production static NAT applied for one host (192.168.1.10) which is translated to NAT IP 172.16.1.5: ip nat inside source static 192.168.1.10 172.16.1.5 ip access-list standard 10 ...
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3answers
195 views

IOS Memory allocation error after ping

I have written a script in Tera Term for a Cisco IR809g which pings 3 different routers(IR 809g) in 2 different networks over the cellular interface. After +- 6 hours I'm getting a Memory allocation ...
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3answers
91 views

Why does using a /27 bit mask cause an error?

I've been working with the ip 192.168.7.0 / 27 with jump 32, when I wanted to put 96 it no longer works for me and it says that the mask is an error. 192.168.7.96 255.255.255.224 MESSAGE FROM CISCO: ...
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15 views

Script Or API way in Cisco ACI to check interface falp statics

Would you have an option to check all the interfaces that is flapping my fabric ? Please help , i'm 1 Month new to this . Thanks.
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1answer
46 views

Change AS Number or add new AS number

We want to change the AS number in our RIPE portal and I want to know we should change the AS number in our Cisco router or we can add new AS number with previous configuration? My current config: ...
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1answer
44 views

Cisco 2851 Static NAT Entry - Similar Static Entry Already Exists

Thank you in advance. I have a few 2851 Cisco ISR. This is my NAT Pool config; ip nat pool NAT-Pool 38.xxx.xxx.193 38.xxx.xxx.206 prefix-length 28 ip nat inside source list 1 pool NAT-Pool overload ...
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1answer
36 views

IPv4 entries L3 switch

I am preparing the spec for L3 switch. I decided to buy the C9300L series switch, but I found out that the C9300L series has no IPv4 routing table entries. What does that mean? What is the impact of ...
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31 views

snmp mib for monitoring service instance counters

in career ethernet switches like ME3600, we can configure EVC as defined in MEF. evc counters(service instance counters) are as follow: rx_green_frames; rx_green_bytes; rx_yellow_frames; ...
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58 views

Cisco IOS XE DHCP Starlink - Static route issue

Today i connected the Starlink dish to an Cisco ISO-XE Box (ISR1111) as a secondary wan link and noticed some strange behavior. I installed a static host-Route to an VPN Tunnel endpoint via ip route x....
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1answer
43 views

NAT not working in cisco packet tracer

Cisco Router Version: 16.7(3r) Cisco Packet Tracer:8.0 x64 Router(config)#interface dialer 1 Router(config-if)#ip nat? % Unrecognized command Router(config-if)#ip nat ? % Unrecognized command Router(...
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1answer
61 views

STP Loop issue on long distance link

I have long distance connectivity between west coast to east cost datacenter via our ISP network as you can see that in following diagram (BSN=Boston, PHX=Phoenix) Now when ISP-A or ISP-B doing any ...
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27 views

Update IOS on Cisco CGS2520 Switch

I need to update the IOS on a Cisco CGS2520 Switch. Not stacked, single switch I have never done this before and I have a couple questions. I do not have physical access to the switch. Looking at the ...

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