Questions tagged [cisco]

The major provider of networking equipment. This is a generic tag to be used when no more specific tags are available. See the list of tags in Help Center Tag page.

Filter by
Sorted by
Tagged with
0
votes
2answers
26 views

How to Change the Date on Cisco Catalyst 3750x Switch

We are using cisco catalyst 3750x 24 port switch series How to Change the Exact Date(Singapore) on a Switch ASW-G-L09-001#show running-config Building configuration... Current configuration : 11883 ...
0
votes
0answers
13 views

how to add ip phone after ASA firewall? [closed]

hi i configure this topology without asa which is working fine , but i have to add asa between router and switch don't know too much about asa. This is the configuration i did for the topology can ...
0
votes
1answer
44 views

Ping to default gateway failing

I am trying to ping to a default gateway which i have configured as 171.2.0.1 but somehow the ping is failing . I am new to network domain so i have less idea about it . Any help is appreciated .This ...
0
votes
0answers
16 views

ASA ping outside to inside private ip's?

i am new asa and cisco as well , what i am trying to do to perform this lab , only 1 issue is there , i need help in it, i can ping from pc0 to router0 in other way I can ping inside to outside , but ...
1
vote
1answer
20 views

Where can one find how much memory is currently allocated to logbuffer?

Do you know where it can be checked, how much memory is currently being used by the logbuffer? some-switch#show log | i Buffer|Trap|udp Buffer logging: level debugging, 2268 messages logged, xml ...
1
vote
1answer
264 views

BGP Best Path Selection Algorithm

According to this cisco document (https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html), shortest AS_PATH is the #4 algorithm in the sequence to evaluate, out of 13 ...
0
votes
1answer
17 views

How to deny ICMP from 1 host on the server - Cisco Packet Tracer

How I can to setup the server firewall to deny any ICMP traffic come only from host 1 while permitting the other. host 1 is a switch Vlan = 192.168.10.2/24 when I do Remote Ip = 192.168.10.2 Wildecard ...
2
votes
1answer
19 views

Trex not receiving any packets

This is my setup to benchmark my server Diagram Trex version v2.88 Trex server MAC ens2f0: f8:f2:1e:5c:bf:78 ens2f1: f8:f2:1e:5c:bf:79 DUT server MAC eth0: fa:16:3e:1c:be:82 eth1: fa:16:3e:d5:37:b1 ...
0
votes
1answer
21 views

4500X performance question

i have a pair of 4500x in VSS with 950x SVI and 6x BGP peers with no full tables (there is no other configs) now i want to configure 4-5x GRE tunnel and and 1-2x gre tunnel will have around 500mbps ...
0
votes
1answer
29 views

Cisco ip helper-address

I am looking at the DHCP documentation and i cannot seam to find how to configure the router to use a loopback interface as the relay-agent. My objective is to use option 82 so that the dhcp server is ...
0
votes
3answers
34 views

L3 switch vlan routing to another gateway

I have a allied telesis switch with VLAN10 & VLAN 20 and a basic ISP Router with no VLAN configuration. ISP router IP is 172.30.50.253 PC1: 172.30.3.x/24 Gateway 172.30.3.254 VLAN30 interface ...
0
votes
2answers
30 views

Per-VLAN DHCP pools on the switch

Let us say I have a switch on which I have created two VLANs 10 and 20. I have set ports 1-10 to be on VLAN 10 and ports 11-20 to be on VLAN 20. Presently the PCs in both VLANs are configured with ...
0
votes
2answers
34 views

Cisco IE4000 Blinking Amber Lights

I have an IE4000 Cisco Switch running my small air gapped network. I came in this morning and found that ALL the ports other than the Trunk port are blinking Amber. I checked the config and the ...
1
vote
0answers
24 views

How can I deny or block an IP Address in Cisco FTD

I have a Cisco Firepower Threat Defense firewall. I want to Block an IP and add blocked ip into BlockedIp rule. How can I achieve it via Web Interface or REST API ? Thank you!
0
votes
2answers
30 views

How to Balance SPAN Traffic from Redundant Switches

So we are wanting to deploy an IDS device to capture EAST-WEST traffic in a LAN. The actual topology is more complicated but our issue boils down to this: We are attempting to configure SPAN sessions ...
6
votes
2answers
710 views

Undo last command(s) in case of losing connection to a Cisco Router

I would like to configure an interface on a remote Cisco router (ISR 4000 series) with IPsec. The only way to connect to it is through the interface that I am trying to encrypt. I want to ensure that ...
0
votes
0answers
19 views

test root-system password on IOS-XR

I've installed quite new NCS-5501-SE devices from Cisco. They're running well. I just remembered that then I initially deployed it, it asked me to set the root-system username and password, which is ...
1
vote
3answers
45 views

How to create/delete multiple VLANs in a single command?

If I want to create 3 VLANs, I've to do it one by one like this. conf t vlan 2 vlan 3 vlan 4 Same thing goes with deletion. conf t no vlan 2 no vlan 3 no vlan 4 Is there a way to do it in a single ...
1
vote
3answers
61 views

Policy Based Routing by Interface and IP

Is it possible on Juniper or Cisco to configure PBR where it matches on an ingress interface AND a source IP address? My scenario traffic flows are as follows: Router1 > Router2 > WAN_Optimiser &...
0
votes
0answers
12 views

Why does Cisco recommends NOT to use VLAN 1 as Management VLAN? [duplicate]

According to the following article; https://www.omnisecu.com/cisco-certified-network-associate-ccna/what-is-management-vlan-and-how-to-configure-management-vlan.php Cisco recommends NOT to use VLAN 1 ...
0
votes
0answers
19 views

L2TP/IPSec on Cisco ISR G2 issues

I am using several ISR G2 routers (819, 2901, etc) configured as L2TP/IPSec VPN concentrators. With current configuration it works good, but there are two odd things about it. I used standard ...
4
votes
3answers
281 views

How to remove switchport mode access from Cisco Switch 2960?

This is in Cisco Packet Tracer - this is not a real switch. Default interface config on Cisco Switch 2960 looks like this ! interface FastEthernet0/10 ! Then I put it in switchport mode access ! ...
1
vote
1answer
31 views

How to differentiate Layer 2 and Layer 3 Cisco Switch based on their config?

Layer 3 Cisco Switch can also been used as Layer 2 only. Is there any specific configuration in Cisco switch to verify this?
3
votes
1answer
145 views

BGP prefix filtering mismatch between peers

the peering between our router and the other peer already established, and we are trying to add new prefix route: 192.168.0.0/24 Failing command ip prefix-list PREFIX-FROM-A seq 15 permit 192.168.0.0/...
0
votes
0answers
51 views

Untagged VLAN in EVPN+VxLAN

I am dealing with very strange issue but wanted to check with experts if i am doing anything stupid or not. I have small size EVPN+VxLAN clos network (OSFP+iBGP+Multicast+Arp-suppression (no ...
1
vote
1answer
39 views

Factory reset Cisco N520-4G4Z-A

I'm having some issues doing a factory reset on above mentioned Cisco box. I've tried several different key combinations and unfortunately previous owner does not remember password The examples on ...
0
votes
2answers
50 views

n3k pause frame issue

We have 2x 10G (LACP) from our upstream that is connected to a n3k-c3064pq-10gx and on their switch they give us another 10g and we have monitor session from that 2x 10G (LACP) on this 10g port and ...
1
vote
0answers
21 views

Mistakenly added switch configuration on Cisco router 2951 so now it is showing gibberish data on CLI

I have Cisco 2951 router in which my colleague mistakenly uploaded switch configuration from tftp server. Now it is showing gibberish data on CLI when it boots up. I tried to get into the ROMmon mode ...
1
vote
1answer
67 views

Cisco Packet Tracer Connection Error - The cable cannot be connected to that port

There are 3 NICs in the Router1 and 24 available ports in the Switch1. Is there any reason why I can't connect from Router1 to Switch1?
1
vote
1answer
22 views

GNS3 can not ping from ethernet interface to serial interface

So I am doing a Lab for one of my classes involving ipv6 and routing using EIGRP. When I set-up the network and assign the router interfaces with IPV6 address I get an issue pinging the whole network. ...
2
votes
2answers
222 views

Can't add VLAN in the “allowed VLAN”

Why is this command not accepted? switchport trunk allowed vlan add 52,160,176,177,247 I tried adding only one VLAN; it's also not accepted. No error is shown or anything; it's just not showing when ...
0
votes
1answer
30 views

Cisco ASA 5506-X: clients periodically lose Internet access

Clients periodically lose Internet access, but I can connect to Cisco ASA and manage it. If i am ping sites, it works: Minsk# ping yandex.ru Type escape sequence to abort. Sending 5, 100-byte ICMP ...
0
votes
0answers
15 views

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 ...
1
vote
1answer
47 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 ...
0
votes
0answers
18 views

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.
0
votes
3answers
29 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 ...
0
votes
0answers
48 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) # ...
0
votes
1answer
43 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. ...
2
votes
4answers
261 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 ...
0
votes
1answer
32 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 ...
2
votes
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 ...
0
votes
0answers
14 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/...
0
votes
0answers
35 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 ...
3
votes
2answers
165 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 ...
1
vote
0answers
33 views

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 ...
0
votes
0answers
6 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 ...
0
votes
1answer
16 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 ...
2
votes
4answers
77 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 ...
1
vote
0answers
42 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 ...
0
votes
3answers
50 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 ...

1
2 3 4 5
69