Questions tagged [cisco]

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6 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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Cisco 8800 Series Incoming Call On Line 1 Show When Calling Line 2 [closed]

I have a cisco 8841 phone with a 3rd party sip setup on 3 lines. So I have 3 lines. And calling any of the 3 numbers rings the phone and when connected shows the corresponding line. But when ringing, ...
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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
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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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1answer
49 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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11 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
44 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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14 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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21 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
38 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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5answers
798 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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26 views

OSPF peering is not forming and is looping through the states [closed]

Any ideas or hints on what could cause an OSPF peering to break and start looping through states indefinitely? The adjacency is formed with no issues after a reboot (of the other peer) and remains ...
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1answer
73 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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1answer
81 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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1answer
47 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
30 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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0answers
22 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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2answers
294 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
34 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
67 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
38 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
61 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
74 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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0answers
51 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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27 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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0answers
32 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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2answers
167 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
88 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
32 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
34 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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0answers
30 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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0answers
48 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
41 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
56 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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29 views

How do I load VLAN database between switches (CISCO 2960)?

I glad for any help on this topic -- netanel
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1answer
33 views

Configure password policy on cisco 2520 version 15.2

I have a cisco 2520 version 15.2 out of box today. I was trying to setup a password policy and no idea how but I managed to lock myself out, did not know about the "reload in X" command ...
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1answer
35 views

How to configure IPV6 /53 subnet on packet tracer?

I have tried configuring a Ipv6 subnet address 2001:0dce:0000:0000::1/53 into the router interface. It works but when the I tried setting the auto-configuration button on the PC connected to this ...
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1answer
35 views

My laptop not comes on the network when connected to cisco 2951 routing port, so it does not ping [closed]

I have assigned 192.168.1.2/24 IP to laptop with 192.168.1.1 gateway. This gateway is actually the IP address of the Cisco 2951 router port. But my laptop doesn't come in the network that's why it ...
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1answer
49 views

How can I monitor BFD flaps?

We need to monitor BFD flaps on our Cisco Nexus devices but the problem is that Zabbix do SNMP polling every 1 minute, and we can't detect, for example, 5 sec BFD flaps. We detect only if BFD down for ...
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2answers
60 views

Ramifications of turning off Spanning Tree for EIGRP network?

Ran into something I've never seen before in a production network I'm new to supporting and wanted to get the communities take on it. I have an EIGRP network that interconnects about 60 sites across a ...
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2answers
56 views

Client's ARP requests affect whether Cisco C897VA receives packages or not

So I have bought used ISR C897VA with an issue: when vlan1 is pinged from windows there are quite a lot of "Request timed out"s. Config-register 0x2142 has been done, as well as resetting ...
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0answers
117 views

Adding a Catalyst 9300 switch to an existing stack without a downtime

We currently have a stack of 2 switches. I would like to add a third switch to this stack. Is it possible to connect this switch without causing a downtime. I think the answer is yes, but ...
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1answer
127 views

Layer 2 (switch) QoS in a LAN or VLAN-based QoS

In my setup above (Cisco 2960 running IOS15), I have all devices marked in red in vlan 20 (WLAN_VLAN), devices in green in VLAN 10 (PC_VLAN) and devices in yellow which are VoIP in the voice vlan. I ...
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1answer
32 views

Cisco 887 Conditional Port Forwarding

I have port forwarding configured on a CISCO 887 for client VPN like this: "ip nat inside source static udp 10.65.1.1 500 interface Loopback1 500" It forwards them to a VPN server. However, ...

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