IP forwarding – notes
Fast switching First packet to a specific destination IP is process switched. With the first packet the router adds an […]
CCIE, Notes, Routing
Notes
CCIE, IP services, Notes
IP services – Notes
ARP Address Resolution Protocol, used to discovery layer two address when IP address is already known. Uses protocol 0x0806 compared
CCIE, Notes, Spanning tree
Spanning tree – notes
Electing the root Only one switch can be the root bridge. From the start all switches announce themselves as the
CCIE, Notes, VLAN
VLAN – Notes
Private VLANs Commonly used in SP networks to put users in common subnet but no direct forwarding of packets between
CCIE, Ethernet, Notes
Ethernet – notes
RJ 45 pinouts 10-BASE-T and 100BASE-TX uses pairs two and three, gigabit Ethernet uses all four pairs. Pinout for straight
CCIE, Notes, QoS
Quality of Service – notes
Hardware queue Packets can be sent trough hardware queue without interrupting CPU Always uses FIFO logic Cannot be affected by
CCIE, MPLS, Notes
MPLS – notes
First defined in RFC 2547 Originally called tag switching and was Cisco proprietary MPLS is the open standard Operates at
BGP, CCIE, Notes
Border Gateway Protocol (BGP) – notes
Uses TCP as transport, port 179 Path vector protocol Checks before becoming a neighbor The TCP connection request must come
CCIE, EIGRP, Notes, Routing
Enhanced Interior Gateway Protocol (EIGRP) – notes
Cisco proprietary Uses IP protocol 88 as transport Support for MD5 authentication (no clear text) Sends updates to 224.0.0.10 Distance
CCIE, Notes, OSPF, Routing
OSPF – Open Shortest Path First (notes)
Defined in RFC 2328 Supports VLSM and CIDR Is a link state protocol Uses a link state database (LSDB)