Dell PowerSwitch S4128F-ON EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 613

Supported releases Number of packets received from neighbor: 7138 Number of packets sent to neighbor: 7138 OS10#show bfd neighbors active * - Active session role -- LocalAddr RemoteAddr Interface State RxInt TxInt Mult VR * 100.100.1.1 100.100.1.2 ethernet1/1/26:1 up 200 200 3 re * 100.100.3.1 100.100.3.2 ethernet1/1/26:3 up 200 200 3 de * 200.1.1.2 200.1.1.1 vlan102 up 200 200 3 bl * 200.1.5.2 200.1.5.1 vlan105 up 200 200 3 de * 200.1.11.2 200.1.11.1 vlan111 up 200 200 3 gr * 200.1.12.2 200.1.12.1 vlan112 up 200 200 3 de * 201.1.1.2 201.1.1.1 vlan101 up 200 200 3 gr 10.4.1.0 or later Border Gateway Protocol Border Gateway Protocol (BGP) is an interautonomous system routing protocol that transmits interdomain routing information within and between autonomous systems (AS). BGP exchanges network reachability information with other BGP systems. BGP adds reliability to network connections by using multiple paths from one router to another. Unlike most routing protocols, BGP uses TCP as its transport protocol. Autonomous systems BGP autonomous systems are a collection of nodes under a single administration with shared network routing policies. Each AS has a number, which an Internet authority assigns-you do not assign the BGP number. The Internet Assigned Numbers Authority (IANA) identifies each network with a unique AS number (ASN). AS numbers 64512 through 65534 are reserved for private purposes. AS numbers 0 and 65535 cannot be used in a live environment. IANA assigns valid AS numbers in the range of 1 to 64511. Multihomed AS Stub AS Transit AS Maintains connections to more than one other AS. This group allows the AS to remain connected to the Internet if a complete failure occurs to one of their connections. This type of AS does not allow traffic from one AS to pass through on its way to another AS. Connected to only one AS. Provides connections through itself to separate networks. For example, Router 1 uses Router 2-the transit AS, to connect to Router 4. Internet service providers (ISPs) are always a transit AS because they provide connections from one network to another. An ISP uses a transit AS to sell transit service to a customer network. When BGP operates inside an AS - AS1 or AS2, it functions as an Internal Border Gateway Protocol (IBGP). When BGP operates between AS endpoints - AS1 and AS2, it functions as an External Border Gateway Protocol (EBGP). IBGP provides routers inside the AS with the path to reach a router external to the AS. EBGP routers exchange information with other EBGP routers and IBGP routers to maintain connectivity and accessibility. Classless interdomain routing Layer 3 613