Sketches of IP, Routing, Internet, Security and Life!
To get an idea about the current number of Internet routes, for both IPv4 and IPv6: moghaddas@USA> show route summary | match “inet|bgp” inet.0: 560133 destinations, 1663174 routes (558798 active, 0 holddown, 1525 hidden) BGP: 1663124 routes, 558752 active inet6.0: 24047 destinations, 47458 routes (23459 active, 0 holddown, 851 hidden) BGP: 47444 … Continue reading “Internet routing table and damping on JunOS”
Highlights of CCIE Security written Study Guide Cisco switches have VLAN 1 already configured which cannot be removed for management purposes, because protocols such as CDP and spanning tree will be active. Step 3: The PC sends a segment that acknowledges (ACK) the router’s reply. The first three steps are commonly known as the TCP three-way handshake … Continue reading “CCIE Security written: 1 – General Networking”
OSPF benefits Fast convergence Variable-length subnet masking (VLSM) Authentication Hierarchical segmentation Route summarization Aggregation Routing Summarization is a major factor in the success of designing your network. To ensure that your network can scale properly, route summarization is the biggest factor against which to measure your success. Without summarization, you have a flat address design … Continue reading “OSPF Design: 3 – Fundamentals”
Ingress LSRs —Ingress LSRs receive a packet that is not labeled yet, insert a label (stack) in front of the packet, and send it on a data link. One that is doing imposition is an ingress LSR Egress LSRs—Egress LSRs receive labeled packets, remove the label(s), and send them on a data link. Ingress and … Continue reading “MPLS Fundamentals: 1 – Architecture”
It’s given that customers of a Service Provider will have overlapping IP addressing in their VPNs, e.g. you will have more than two customers who use the 10.0.0.0/8 network. The RD is how you tell them apart. If you have customer “A” with RD “A” and customer “B” with RD “B” the routes “A:10.0.0.0/8” and … Continue reading “RT & RD difference”
