Found inside – Page 40Having redundant routers requires setup and is controlled by a protocol such as Hot Standby Router Protocol (HSRP), which I discuss in Chapter10, “Redundancy Protocols.” Scalable VLANs on a given access switch should not be advertised ... Using multiple routers or multilayer switches can provide Layer-3 redundancy for hosts: However, the Layer-3 redundancy must be transparent to each host. 9 – FHRP Concepts. The transition from one forwarding router to another is transparent to the end devices. It is more difficult to obtain host redundancy for critical systems inside the firewall. This topic covers the following high availability features of Juniper Networks EX Series Ethernet Switches: The RedBox devices have two interesting features: The most current RedBox-type devices are very versatile and configurable by the administrator: Redundancy protocols improve two of the three pillars of security by duplicating messages: availability and integrity. Redundancy Switching. VCL-2724, Parallel Redundancy Protocol (PRP) Switch allows the transmission of duplicated data over two parallel links, simultaneously, with zero packet loss. PRP is a protocol to ensure high availability and reduce the network recovery time and, therefore, the transmission to "zero". Cyclic redundancy Checking (CRC) is another feature found in the data link layer that provides the ability to detect if a received frame was damaged. The PRP protocol is located within an IP network frame. Thus, this layer takes the network interface into consideration before con-verting the packet. So when a router goes down or the link into the router fails, there is a second physical device ready to respond to the same default gateway address infor… The best choices for this are Cisco’s proprietary Hot Standby Routing Protocol (HSRP) or the open standard Virtual Router Redundancy Protocol (VRRP). If the segment is being used primarily to interconnect network devices, then it might make more sense to use a dynamic routing protocol such as OSPF, EIGRP or BGP. VRRP enables hosts on a LAN to make use of redundant routing platforms on that LAN without requiring more than the static configuration of a single default route on the hosts. The shared address of the next-hop router redundancy group is not the real address of a router interface. Configure Switch. VSRP - Virtual Switch Redundancy Protocol. switch supports three different protocols to support this Redundancy Protocol function: • Turbo Ring and Turbo Ring V2 • Turbo Chain • Rapid Spanning Tree and Spanning Tree Protocols (IEEE 802.1W/802.1D-2004) When configuring a redundant ring, all switches on the same ring must be configured to use the same redundancy protocol. They are DANH nodes. Redundant devices, such as multilayer switches or routers, provide the capability for a client to use an alternate default gateway should the primary default gateway fail. We looked at active standby redundancy in switches using the spanning tree protocol. With Hirschmann™ RSP switches, which support the new IEC-standard redundancy protocols (PRP, HSR*), networks can now be built for the first time with genuinely uninterrupted data communication. The HSRP stands for hot standby router protocol. STP uses timers to learn network topology. With Hirschmann RSP switches, which support the new IEC-standard redundancy protocols (PRP, HSR*), networks can now be built for the first time with genuinely uninterrupted data communication. (Choose two.) Found inside – Page 401The ring network requires that each switch supports a redundancy protocol, otherwise, a message would travel around the network indefinitely. Ring protocols generally disable one link (backup link) to stop messages from re-circulating ... Redundant components make the single switch more tolerant, yet if the switch fails, the server farm is unavailable.
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