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Basic MPLS - Intro

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Basic MPLS MPLS - Multi-Protocol Label Switching. Operates at OSI layer 2.5. This position provides additional features for the transport of data across networks. Traditional IP Networks: Each router on service provide network, does route lookup (IP routing) to decide next-hop where it needs to forward packets to. Each router performs an independent decision on where to forward packet to. This repeated check happens on every device where the packet has to transverses across. MPLS Enabled Networks; Instead of IP lookup, MPLS enabled network rely on label switching which is fast and needs less resources on routers where it transverses. First router(INGRESS) does IP lookup and all routers within Service provider does Label switching until the packet arrives at the LSR router(which is directly connected to egress PE) where outer label is stripped off (PHP) and the packet together with inner label passed to LSP destination (Egress PE). MPLS Label: a). Inner label -- Identifi...
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Enterprise Soln: High Availability - VRRP / HSRP

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  VRRP:  Virtual Router Redundancy Protocol Implementation Topology:   Configurations; Primary-Router: Interface gi0/1 description LAN vrrp 1 ip 10.1.1.254 vrrp 1 priority 110  vrrp 1 track gi0/0 65   ///default is 10 vrrp 1 track 100 decrement 65    // Track internet Track Internet Reachability: R1(config)#ip sla monitor 10 R1(config-sla-monitor)#type echo protocol ipIcmpEcho 8.8.8.8 R1(config-sla-monitor-echo)#frequency 5 R1(config-sla-monitor-echo)#exit R1(config)#ip sla monitor schedule 10 life forever start-time now R1(config)#track  100 rtr 10 Secondary-Router: interface gi0/1 description LAN-sec-gw ip address 10.1.1.2 255.255.255.0 vrrp 1 ip 10.1.1.254 vrrp 1 priority 90      vrrp 1 track 1 gi0/0 20 Note: 1) Default Priority is 100 (higher is better) ; So you need to set the Secondary Router with a slightly lower Value 2) No need to s...
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