How to Bring Up a SVI Interface Cisco Switch
SVI must meet all of the following conditions to transition to the full “up/up” state.
1- The VLAN must exist and be active in the VLAN database.
2- At least one switched port in the VLAN (access or trunk) must be up.
3- That port must be in the STP forwarding state.
Sometimes it is necessary to have that VLAN interface up even if there are no devices or ports using that VLAN
simply forced the VLAN into an “up/up” state. Issuing the “no autostate” command on the VLAN interface will bring the interface up. Basically, the command just tells the VLAN interface to ignore the above mentioned prerequisites. Note: This command is only available in certain IOS images.
how to stop error %Error opening tftp://255.255.255.255/ on cisco router
Problem: Service Configuration Error Messages
Occasionally, during bootup of Cisco hardware through Cisco IOS software, error messages similar to these are displayed:
- %Error opening tftp://255.255.255.255/network-confg (Socket error)
- %Error opening tftp://255.255.255.255/cisconet.cfg (Socket error)
- %Error opening tftp://255.255.255.255/3620-confg (Socket error)
- %Error opening tftp://255.255.255.255/3620.cfg (Socket error)
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Cisco Router Console Connection giving garbage
If you are connecting console cable on Cisco Router and on your terminal window are giving garbage or not human readable output
with below Connection setting .
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CCIE RS LAB config mistake BGP neighbor not coming up
While I was configuring BGP neighbors it was not coming up .
What I did mistake
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Call is connecting but phone is not ringing CCIE Voice LAB setup
I was trying to build the CCIE Voice lab for practice and learn Cisco Voice .I configured T1 connection from HQ site to PSTN T1 with tree channels .HQ site I had to configure HQ site MGCP with using three channels .I configured the MGCP on T1 line and it was registered in CUCM. I configured T1 line channels manually because i wanted to use 3 channels . as soon as i was applying the registering on cucm it was making it 24 channels . but T1 channels was up and multiple frame was established .when i was calling from HQ site to PSTN phone On the phone call was showing connected but PSTN phone was not ringing. I did the mistake on my PSTN router I did not configured following parameter. so it was not ringing my phone .
dial-peer voice 1 pots
incoming called-number .
Below was the my configuration on HQ site and PSTN site .
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How to test call from Cisco IOS command
If you want to test call from CISCO Router IOS command line to check your DN or dial-peer is working .
just enter the command and its a hidden command .
Router#csim start “number you want to call“
For Example if you want to test a destination number 9839422 enter the command as below.
Router#csim start 9839422
Cisco CME SIP extension as X-lite Phone
1- Allows SIP phones to call other SIP phones and H323 calls
voice service voip
allow-connections sip to sip
allow-connections sip to H323
allow-connections H323 to sip
allow-connections H323 to H323
2- Enable IOS SIP Registrar
registrar server expires max 1200 min 300
3- configure the voice register configuration The “voice register global” configuration is similar to the telephony-service configurations used for SCCP phones.
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Cisco CME and ephone Button Command attributes
: Normal Ring
b Call waiting Beep No ring
f Feature Ring
m Monitor mode
o Overlay Line no call waiting
c Overlay Line with call waiting
x Overlay expansion /Roll over
s Silent Ring
w Watch mode
Button Number (Attribute ) Directory Number
For Example if we have to configure one line when call comes there are silent ring on button no 2 and ephone-dn 10
#button 2 s 10
How to configure cisco router as NTP server
1- you have to obtain public NTP server addresses from www.ntp.org
2- configure you router with NTP server IP
GK_RTR(config)#ntp server 126.96.36.199
GK_RTR(config)#clock timezone ARIZONA -7
3- Verifying NTP Configurations
GK_RTR#show ntp associations
4- After you configure the Cisco router to synchronize with an NTP server, you can configure it to provide date and time information to a CUCM server and other devices,
To allow other devices (such as a CUCM server) to pull date and time information from a Cisco router using NTP, use the ntp master <stratum number> command from global configuration mode.
Entering ntp master 4 instructs the Cisco router to deliver date and
time information to requesting clients, marking it with a stratum number of 4.
Cisco Router as DHCP Server
Using a Cisco router as a DHCP server is a somewhat common practice in smaller networks.In this example we have two VLANs one for Voice and one for DATA.
DATA VLAN IP Nework Range 172.16.1.0 Gateway IP 172.16.1.1 DNS Server 10.31.144.1
Voice VLAN IP Nework Range 172.16.2.0 Gateway IP 172.16.2.1 DNS Server 10.31.144.1
TFTP Server for Cisco Phones 172.16.2.1
GK_RTR(config)#ip dhcp excluded-address 172.16.1.1 172.16.1.9
GK_RTR(config)#ip dhcp excluded-address 172.16.2.1 172.16.2.9
GK_RTR(config)#ip dhcp pool DATA_SCOPE
GK_RTR(dhcp-config)#network 172.16.1.0 255.255.255.0
GK_RTR(config)#ip dhcp pool VOICE_SCOPE
GK_RTR(dhcp-config)#network 172.16.2.0 255.255.255.0
GK_RTR(dhcp-config)#option 150 ip 172.16.2.1
If you are using Windows server or some other centralized device for DHCP services. Even Cisco Unified Communications Manager includes DHCP server capabilities. you need to configure ip helper-address <central DHCP server IP address> to your VLAN interface to forward DHCP requests to the central DHCP server for the voice and Data VLANs.