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Forum Posts
Dear All, our Catalyst 2960X was MAC flooded by an Apple USB-C Hub with randomized MAC addresses. Have you ever observed a similar behavior in connection with Apple USB-C Hubs ? Port-Security brought the MAC flooding to a halt. Within a few seconds t...
Resolved! Conflicting VLANs on Catalyst switch
I have a very old switch, a WS-C2950C-24. I've tried IOS both C2950-I6K2L2Q4-M, Version 12.1(22)EA7 (what I got it with) and EA14 (the most recent one I could dig up on the fora, since Cisco no longer offers this download). I've tried flashing via xm...
On an RV345P the firewall blocks the return from static routes, on an RV320 it works perfectly. I have a route from 192.168.12.x to 192.168.132.0 with gateway 192.168.12.12. The ping returns well and the route is perfect, but it does not return the c...
Hi everyone, could anyone help me? Previously we had a stack of switches with 4 (3750x) but we migrated the function to cisco nexus and we unpacked that stack using the switches individually.But every switch even unconfiguring the power-stack is aler...
Resolved! Nexus 5k ACL DHCP issue.
Trying to Configure an ACL for one of our Fex. More specifically I want to create an ACL that allows the only VLAN on the Fex to our two DHCP servers. Nexus 5k system image file is: bootflash:///n6000-uk9.7.3.2.N1.1.bin The below config ...
Hello, I have a SG300 switch, configured as follow : - L3 enabled - VLAN 1 : 10.0.10.0/24 (switch IP : 10.0.10.2) - VLAN 30 : 10.0.30.0/24 (switch IP : 10.0.30.1) - Internet access : 10.0.10.1 (with VLAN 1) - Defaut gateway (IP 0.0.0.0 - Prefix 0 - R...
Resolved! Subnet mask --- broadcast domain
Hi, This is a basic question, I'm not a network guy and I need to understand some basic staff. Thanks in advance for your help. In my enterprise I need to create 2 subnets to include about 200 IP each one, so I will mask the subnets with /24 I.E: 1...
I noticed udp/18999 is always listed in #show udp even if no IP is configured as1r3#show udp Proto Remote Port Local Port In Out Stat TTY OutputIF 17 0.0.0.0 0 172.16.254.13 18999 0 0 11 0 What's so special about UDP/18999? Is this the first epheme...
Can the Catalyst 3650 24 PD be reset to factory settings We just received 2 of these switches and I copy the supplied config from IBM to both switches but reported that the IP they had for one of the switches would conflict with the main switch that...
Hello, I have a very large network which has several firewalls. I have never seen some of these sites and I am wrapping my head around the network as a whole. I do not have a master topology map to show me the layout, so I have been using tracert ...
I hope you guys are ok and before I start, just thanks to everyone. I am starting to prepare my Cisco training however I just find myself into a problem at work. I have PC and phone (VoIP) connected throught the same cable, meaning that the phone...
Hi,I'm learning about the UTP cables and the two standards T568A and T568B. I learnt that only two pairs (Pins: 1,2,3,6) are used for transmit and receive.Then why we need other two pairs (Pins:4,5,7,8) ?Any idea?Thanks in advance.Regards,Chandu
Hi I am working on 3850 switches and need to config QoS. I do realize that it doesnt support mls qos anymore and was following the IOS based qos where I created ACL, followed by class-maps and finally tried to use service-policy on the interface to a...
Hello Guys, I really wanted to know the right answer on this question, How does a router handle an incoming packet whose destination network is missing in the routing table? A. It discards the packet B. It Broadcast the packet to each network on t...
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