Posts in 2013
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OSPFv3
Sunday, December 01, 2013 in Cisco Networking
If you control OSPFv2 (IPv4 OSPF) wou wont have any problems here. There are, however, a few differences in the configuration. First one - it’s configured on the INTERFACE LEVEL, and the Area is also defined there, so there is no need to add …
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Advanced BGP Features: Route Dampening
Monday, November 25, 2013 in Cisco Networking
When you check the BGP prefixes using the “show ip bgp”, besides the arguments that appeared so far (*, >, r) there is another “Tag” that can appear, and it’s a letter “d”, which stends for DAMPENING. …
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BGP Peer-Session Templates
Saturday, November 23, 2013 in Cisco Networking
Another way to make the BGP configuration easier by avoiding configuring the same command set on every router. It makes your life easier if you have various neighbors to which you’d like to apply a common set of attributes. Step 1: Define the …
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Convert MAC to Link Local IPv6 Address
Thursday, November 21, 2013 in Cisco Networking
Check how the Link Local address has been generated using the interface MAC address using the following command: #sh int fa0/0 | i Hard Hardware is Gt96k FE, address is 001e.be5d.27f0 (bia 001e.be5d.27f0) IPv6: FE80::21E:BEFF:FE5D:27F0 Step 1: Start …
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IPv6 Basics
Thursday, November 21, 2013 in Cisco Networking
Loopback: ::1/128 Multicast: FF00::/8 Link Local: FE80::/10 - used for stateless auto-configuration, Neighbor discovery, Router discovery FC00::/7 Unique Local, Unicast (equivalent to the IPv4 private addresses), not routable via global BGP EUI-64 - …
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OSPF Forward Address Suppression
Wednesday, November 20, 2013 in Cisco Networking
The aim is to SUPRESS the address of the router that originated the Prefix. When the area is NSSA, and you want to CONTROL the remap process of the LSA7 to LSA5, but use 0.0.0.0 as the forwarding address instead of the one specified in the LSA7: …
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NTP - Network Time Protocol
Friday, November 15, 2013 in Cisco Networking
First there is an “old school” method of setting time on your IOS Device, which is fine if you’re one of those :) #clock set 16:50:00 15 NOVEMBER 2013 *Nov 15 16:50:00.000: %SYS-6-CLOCKUPDATE: System clock has been updated from …
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IRDP - ICMP Router Discovery Protocol
Thursday, November 14, 2013 in Cisco Networking
IRDP enables Routers to automatically discover the IP of their potential Default Gateway. It uses ICMP and Solicitation Messages. Potential GW Routers periodically announce the IP address of their IRDP configured interface to a roadcast destination. …
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GLBP - Configure the Global Load Balancing Protocol
Wednesday, November 13, 2013 in Cisco Networking
GLBP is different from HSRP and GLBP, as in - it’s more complex and gives more possibilities, such as LoadBalancing It’s got 1 VIRTUAL IP, and VARIOUS MACs !!!You can have UP TO 4 ROUTERS IN A GLBP GROUP!!! GLBP Group Members communicate …
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VRRP - Configure the Virtual Routing Redundancy Protocol
Wednesday, November 13, 2013 in Cisco Networking
The VRRP configuration is similar to the HSRP, with a few slight differences. For example, there are no ACTIVE and STANDBU, but MASTER and BACKUP router, as shown below: #show vrrp brief Interface Grp Pri Time Own Pre State Master addr Group addr …