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R1:- interface Loopback0  ip address 1.1.1.1 255.255.255.255 interface FastEthernet2/0 Description “ Connected to R2”  ip address 12.12.12.1 255.255.255.0  no shut router bgp 1  no synchronization  bgp log-neighbor-changes  network 1.1.1.1 mask 255.255.255.255  neighbor 12.12.12.2 remote-as 2  neighbor 12.12.12.2 send-community both  neighbor 12.12.12.2 route-map setCommunity out  \Setting community value to all R1 Routes\  no auto-summary route-map setCommunity…

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Summarization is used to summarize small subnets to bigger subnet in order to reduce the routing table. Once the summarization is done all the child subnets are suppressed and only summarize route is advertise to the neighbor. Summarization is done under interface prompt and will be applicable to neighbor attached on the interface. If you…

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R1:- interface Loopback0  ip address 1.1.1.1 255.255.255.255 interface FastEthernet2/0 description “connected to R2”  ip address 12.12.12.1 255.255.255.0 no shut router eigrp 1  network 1.1.1.1 0.0.0.0  network 12.12.12.1 0.0.0.0  eigrp router-id 1.1.1.1 no auto-summ R2:- interface Loopback0  ip address 2.2.2.2 255.255.255.255 interface FastEthernet0/0 description “connected to R3”  ip address 23.23.23.2 255.255.255.0 no shut interface FastEthernet1/0 description…

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Below is the configuration example for None Community. As we have seen in previous examples that Community is the attribute which can be used to apply policies on he routes. Instead of matching individual routes to apply policy we can use community to reduce the repetitive work. We just need to match route community and apply policy…

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R1:- interface Loopback0  ip address 1.1.1.1 255.255.255.255 interface FastEthernet2/0 Description “ Connected to R2”  ip address 12.12.12.1 255.255.255.0  no shut router bgp 1  no synchronization  bgp log-neighbor-changes  network 1.1.1.1 mask 255.255.255.255  neighbor 12.12.12.2 remote-as 2  neighbor 12.12.12.2 send-community both  –<< Without it Community will not send to neighbor  neighbor 12.12.12.2 route-map setCommunity out  no auto-summary…

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BGP has few well known community and No-export is one of them. In IGP we uses Tagging to identity perticular routes but in bgp there is no tagging but in BGP we have Communities.  Community is very much similar to tagging which can be set on a router and send to the neighbor routers. Neighbor…

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Below is the configuration example of policy based routing. Routing is done only based on destination but PBR is the method by which routing can be done based on the source as well. In below example we want that Traffic from PC1 to PC2 must go via R2 and Traffic between PC3 and PC4 will…

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R1:- interface FastEthernet0/0  ip address 12.12.12.1 255.255.255.0 no shut ip route 0.0.0.0 0.0.0.0 12.12.12.2 track 10 ip sla 10  icmp-echo 12.12.12.2 ip sla schedule 10 life forever start-time now track 10 ip sla 10 reachability R2:- interface FastEthernet0/0  ip address 12.12.12.2 255.255.255.0 no shut verification:- R1# show track 10 Track 10   IP SLA 10…

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All Cisco documents says it is not possible to create EIGRP neighborship on secondary addresses.  Let test in our LAB and check if it really a true statement. R1:- interface FastEthernet0/0  ip address 112.112.112.1 255.255.255.0 secondary  ip address 12.12.12.1 255.255.255.0  no shut end router eigrp 1  network 112.112.112.1 0.0.0.0 R2:- interface FastEthernet0/0  ip address 112.112.112.2…

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R1:- interface Loopback0  ip address 1.1.1.1 255.255.255.255 interface FastEthernet0/0  description *** Connected to PC1 ***  ip address 10.1.1.1 255.255.255.0  no shut interface FastEthernet0/1  description *** Connected to R2 ***  ip address 12.12.12.1 255.255.255.0 no shut router ospf 100  log-adjacency-changes  network 1.1.1.1 0.0.0.0 area 0  -<< Loopback advertisement  network 10.1.1.1 0.0.0.0 area 0 –<<LAN subnet advertisement…

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