Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.1P1 - Page 471
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IPv6 Reachability and IPv6 Interface Address. Also, a new IPv6 protocol identifier has also been included in the supported TLVs. The new TLVs use the extended metrics and up/down bit semantics. Multi-topology IS-IS adds TLVs: • MT TLV - contains one or more Multi-Topology IDs in which the router participates. This TLV is included in IIH and the first fragment of an LSP. • MT Intermediate Systems TLV - appears for every topology a node supports. An MT ID is added to the extended IS reachability TLV type 22. • MT Reachable IPv4 Prefixes TLV - appears for each IPv4 an IS announces for a given MT ID. Its structure is aligned with the extended IS Reachability TLV Type 236 and it adds an MT ID. • MT Reachable IPv6 Prefixes TLV - appears for each IPv6 an IS announces for a given MT ID. Its structure is aligned with the extended IS Reachability TLV Type 236 and add an MT ID. By default, Dell Networking OS supports dynamic host name exchange to assist with troubleshooting and configuration. By assigning a name to an IS-IS NET address, you can track IS-IS information on that address easier. Dell Networking OS does not support ISO CLNS routing; however, the ISO NET format is supported for addressing. To support IPv6, the Dell Networking implementation of IS-IS performs the following tasks: • Advertises IPv6 information in the PDUs. • Processes IPv6 information received in the PDUs. • Computes routes to IPv6 destinations. • Downloads IPv6 routes to the RTM for installing in the FIB. • Accepts external IPv6 information and advertises this information in the PDUs. The following table lists the default IS-IS values. Table 44. IS-IS Default Values IS-IS Parameter Complete sequence number PDU (CSNP) interval IS-to-IS hello PDU interval IS-IS interface metric Metric style Designated Router priority Circuit Type IS Type Equal Cost Multi Paths Configuration Information Default Value 10 seconds 10 seconds 10 Narrow 64 Level 1 and Level 2 Level 1 and Level 2 16 To use IS-IS, you must configure and enable IS-IS in two or three modes: CONFIGURATION ROUTER ISIS, CONFIGURATION INTERFACE, and ( when configuring for IPv6) ADDRESS-FAMILY mode. Commands in ROUTER ISIS mode configure IS-IS globally, while commands executed in INTERFACE mode enable and configure IS-IS features on that interface only. Commands in the ADDRESS-FAMILY mode are specific to IPv6. NOTE: When using the IS-IS routing protocol to exchange IPv6 routing information and to determine destination reachability, you can route IPv6 along with IPv4 while using a single intra-domain routing protocol. The configuration commands allow you to enable and disable IPv6 routing and to configure or remove IPv6 prefixes on links. Except where identified, the commands described in this chapter apply to both IPv4 and IPv6 versions of IS-IS. Intermediate System to Intermediate System 471
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