Static Routing From my previous post on addressing, the routing table below is for R1 and R2 which are connected using their Fa 0/0 interfaces. The [updated] option gives the time the route was installed into the routing table. R1#show ipv6 route updated IPv6 Routing Table - default - 3 entries Codes: C - Connected, … Continue reading IPv6 Routing – Static and Basics
IPv6 General Prefix and SLAAC Examples
General Prefix This is great for allowing auto configuration on a site. You can configure a /48 global prefix, then allocate prefixs(subnets) per derived from it! The names global prefix can contain more than one /48 address to aid migration of a whole site. Example: R1(config)#ipv6 general-prefix NOTEPAD 2001:CAFE:CAFE::/48 R1(config)#int fa 0/0 R1(config-if)#ipv6 address NOTEPAD … Continue reading IPv6 General Prefix and SLAAC Examples
IPv6 Notes – Addressing Basics
I've been reading Cisco Press IPv6 Fundamentals, which is a fantastic guide to IPv6. These notes are to jog my memory. Addressing This has been written about a lot by other who are better at explaining it. The simple to remember bits are: 128 Bit Only unicast or multicast. No Broadcast. concatenated by :: once … Continue reading IPv6 Notes – Addressing Basics
Windows 10 Wireless Network Passwords
For Windows 10, Sometimes i need to get the password back for a wireless SSID I've previously joined. This is the commands to grab the wireless networks that you've configured yourself: netsh wlan show profile This is the command to grab a password you entered: netsh wlan show profile "Network Name" key=clear This post is … Continue reading Windows 10 Wireless Network Passwords
Switch HTTP/S Open Ports
A reminder to myself to disable http/s services to stop ports listening on the switch/router. Switch#show tcp brief all TCB Local Address Foreign Address (state) 05CA4BA0 *.443 *.* LISTEN 05CA4308 *.443 *.* LISTEN 04AEF8BC *.80 *.* LISTEN 04AEF024 *.80 *.* LISTEN Switch#conf t Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#no ip http … Continue reading Switch HTTP/S Open Ports
Nexus SFP Invalid – Validation Failed
This is a note to remind myself of this error in the future. On site today i cam across a port member of a port channel associated with a vPC not coming up. Checking the status gave: Core_Switch# show int eth 1/11 status -------------------------------------------------------------------------------- Port Name Status Vlan Duplex Speed Type -------------------------------------------------------------------------------- Eth1/11 -- sfpInvali … Continue reading Nexus SFP Invalid – Validation Failed
Nexus NTP Bug
I came across a problem when setting up NTP on Nexus 7710s where despite the ntp server being known, reachable and working for other platforms; it wasn't creating an association. When debugging, the following error appeared: ntp: setting global CMI msg req to NULL This seems to relate to a known issue known by Cisco … Continue reading Nexus NTP Bug
Avaya Phones and Cisco Switches
I was recently troubleshooting Avaya phones not going into their correct voice vlan. interface GigabitEthernet1/0/1 switchport access vlan 100 switchport mode access switchport voice vlan 200 The phone kept on going into vlan 100. I checked CDP and also enabled LLDP which didn't help. LLDP showed me the phone sitting nicely in the access vlan. … Continue reading Avaya Phones and Cisco Switches
Cisco WLC – Flexible Radio Assignment
This is a great feature of the Cisco WLC >8.2 software and 2800/3800 APs. For selected APs, the second radio can be used dynamically and have its purpose allocated by the WLC. I tested this recently during a setup of a small controller and 6 APs, because they all within 1 metre of each other. … Continue reading Cisco WLC – Flexible Radio Assignment
