Network Study Site

OSPFv3 IPv6 and IPv4

2023 Sept 13

OSPFv3 IPv6 and IPv4 OSPFv3 is a link-state Interior Gateway Protocol (IGP) capable of routing for address-families IPv4 and IPv6. OSPFv3 uses an IPv6 link-local address for control plane operations, such as neighbor discovery and routing information exchange ...

Q-in-Q

2023 Aug 24

Q-in-Q Q-in-Q allows the tunneling of VLANs by double-tagging Ethernet frames with two VLAN tags. This creates an inner and an outer VLAN tag. The inner VLAN tag is referred to as the customer VLAN, the outer tag is the service VLAN. With this technology, service providers can ...

Dynamic ARP Inspection (DAI)

2023 Aug 22

Dynamic ARP Inspection (DAI) Dynamic ARP Inspection (DAI) works with trusted and untrusted ports to identify potentially malicious devices in a network. On untrusted ports DAI inspects the IP address to MAC address bindings of captured ARP packets. If an ARP request arrives on an untrusted ...

DHCP Snooping

2023 Aug 19

DHCP Snooping DHCP snooping protects against rogue DHCP servers and malicious DHCP communication by tracking untrusted clients in a dynamic binding table. The DHCP snooping binding table can be exported to a remote file server for analysis. DHCP snooping treats ...

VLAN Access-List (VACL)

2023 Aug 18

VLAN Access-List (VACL) A VLAN access-list (VACL) can drop or permit IPv4 or IPv6 traffic between hosts that reside on the same subnetwork and within a single VLAN. The term VLAN access-list and VLAN access-map are interchangeably used to refer to this technology. A VACL is applied to a ...

MPLS TE Interarea Tunnel

2023 June 29

MPLS TE Interarea Tunnel MPLS Traffic Engineering tunnels can be configured across IGP areas. An MPLS network may be deployed with a hierarchical design by using different OSPF areas or IS-IS levels. As a result, functional layers can be created such as a Core Layer and an Aggregation ...

BGP Additional Paths

2023 June 28

BGP Additional Paths The BGP Additional Paths feature enables a BGP Route Reflector (RR) to advertise multiple paths to the same destination, instead of selecting only the best path by default. The RR’s default behavior of BGP path hiding prevents the RR clients from receiving multiple paths ...

BGP Best External

2023 June 14

BGP Best External The BGP Best External feature ensures that a router advertises its eBGP route to iBGP peers even if it prefers an iBGP route as the best path to reach a particular prefix learned via eBGP. The BGP Best External feature provides a backup path and as a result it improves the failover time ...

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