ISIS **** ISIS (Intermediate System to Intermediate System) is a routing protocol which is described in *ISO10589*, **RFC 1195**, **RFC 5308**. ISIS is an IGP (Interior Gateway Protocol). Compared with RIP, ISIS can provide scalable network support and faster convergence times like OSPF. ISIS is widely used in large networks such as ISP (Internet Service Provider) and carrier backbone networks. Configuring isisd ================= There are no *isisd* specific options. Common options can be specified (Common Invocation Options) to *isisd*. *isisd* needs to acquire interface information from *zebra* in order to function. Therefore *zebra* must be running before invoking *isisd*. Also, if *zebra* is restarted then *isisd* must be too. Like other daemons, *isisd* configuration is done in ISIS specific configuration file "isisd.conf". ISIS router =========== To start the ISIS process you have to specify the ISIS router. As of this writing, *isisd* does not support multiple ISIS processes. [no] router isis WORD Enable or disable the ISIS process by specifying the ISIS domain with 'WORD'. *isisd* does not yet support multiple ISIS processes but you must specify the name of ISIS process. The ISIS process name 'WORD' is then used for interface (see command "ip router isis WORD"). net XX.XXXX. ... .XXX.XX no net XX.XXXX. ... .XXX.XX Set/Unset network entity title (NET) provided in ISO format. hostname dynamic no hostname dynamic Enable support for dynamic hostname. area-password [clear | md5] domain-password [clear | md5] no area-password no domain-password Configure the authentication password for an area, respectively a domain, as clear text or md5 one. log-adjacency-changes no log-adjacency-changes Log changes in adjacency state. metric-style [narrow | transition | wide] no metric-style Set old-style (ISO 10589) or new-style packet formats: * narrow Use old style of TLVs with narrow metric * transition Send and accept both styles of TLVs during transition * wide Use new style of TLVs to carry wider metric set-overload-bit no set-overload-bit Set overload bit to avoid any transit traffic. purge-originator no purge-originator Enable or disable **RFC 6232** purge originator identification. ISIS Timer ========== lsp-gen-interval (1-120) lsp-gen-interval [level-1 | level-2] (1-120) no lsp-gen-interval no lsp-gen-interval [level-1 | level-2] Set minimum interval in seconds between regenerating same LSP, globally, for an area (level-1) or a domain (level-2). lsp-refresh-interval [level-1 | level-2] (1-65235) no lsp-refresh-interval [level-1 | level-2] Set LSP refresh interval in seconds, globally, for an area (level-1) or a domain (level-2). max-lsp-lifetime (360-65535) max-lsp-lifetime [level-1 | level-2] (360-65535) no max-lsp-lifetime no max-lsp-lifetime [level-1 | level-2] Set LSP maximum LSP lifetime in seconds, globally, for an area (level-1) or a domain (level-2). spf-interval (1-120) spf-interval [level-1 | level-2] (1-120) no spf-interval no spf-interval [level-1 | level-2] Set minimum interval between consecutive SPF calculations in seconds. ISIS region =========== is-type [level-1 | level-1-2 | level-2-only] no is-type Define the ISIS router behavior: * level-1 Act as a station router only * level-1-2 Act as both a station router and an area router * level-2-only Act as an area router only ISIS interface ============== [no] router isis WORD Activate ISIS adjacency on this interface. Note that the name of ISIS instance must be the same as the one used to configure the ISIS process (see command "router isis WORD"). To enable IPv4, issue "ip router isis WORD"; to enable IPv6, issue "ipv6 router isis WORD". isis circuit-type [level-1 | level-1-2 | level-2] no isis circuit-type Configure circuit type for interface: * level-1 Level-1 only adjacencies are formed * level-1-2 Level-1-2 adjacencies are formed * level-2-only Level-2 only adjacencies are formed isis csnp-interval (1-600) isis csnp-interval (1-600) [level-1 | level-2] no isis csnp-interval no isis csnp-interval [level-1 | level-2] Set CSNP interval in seconds globally, for an area (level-1) or a domain (level-2). isis hello padding Add padding to IS-IS hello packets. isis hello-interval (1-600) isis hello-interval (1-600) [level-1 | level-2] no isis hello-interval no isis hello-interval [level-1 | level-2] Set Hello interval in seconds globally, for an area (level-1) or a domain (level-2). isis hello-multiplier (2-100) isis hello-multiplier (2-100) [level-1 | level-2] no isis hello-multiplier no isis hello-multiplier [level-1 | level-2] Set multiplier for Hello holding time globally, for an area (level-1) or a domain (level-2). isis metric [(0-255) | (0-16777215)] isis metric [(0-255) | (0-16777215)] [level-1 | level-2] no isis metric no isis metric [level-1 | level-2] Set default metric value globally, for an area (level-1) or a domain (level-2). Max value depend if metric support narrow or wide value (see command "metric-style [narrow | transition | wide]"). isis network point-to-point no isis network point-to-point Set network type to 'Point-to-Point' (broadcast by default). isis passive no isis passive Configure the passive mode for this interface. isis password [clear | md5] no isis password Configure the authentication password (clear or encoded text) for the interface. isis priority (0-127) isis priority (0-127) [level-1 | level-2] no isis priority no isis priority [level-1 | level-2] Set priority for Designated Router election, globally, for the area (level-1) or the domain (level-2). isis psnp-interval (1-120) isis psnp-interval (1-120) [level-1 | level-2] no isis psnp-interval no isis psnp-interval [level-1 | level-2] Set PSNP interval in seconds globally, for an area (level-1) or a domain (level-2). isis three-way-handshake no isis three-way-handshake Enable or disable **RFC 5303** Three-Way Handshake for P2P adjacencies. Three-Way Handshake is enabled by default. Showing ISIS information ======================== show isis summary Show summary information about ISIS. show isis hostname Show information about ISIS node. show isis interface show isis interface detail show isis interface Show state and configuration of ISIS specified interface, or all interfaces if no interface is given with or without details. show isis neighbor show isis neighbor show isis neighbor detail Show state and information of ISIS specified neighbor, or all neighbors if no system id is given with or without details. show isis database show isis database [detail] show isis database [detail] show isis database detail Show the ISIS database globally, for a specific LSP id without or with details. show isis topology show isis topology [level-1|level-2] Show topology IS-IS paths to Intermediate Systems, globally, in area (level-1) or domain (level-2). show ip route isis Show the ISIS routing table, as determined by the most recent SPF calculation. Traffic Engineering =================== Note: At this time, FRR offers partial support for some of the routing protocol extensions that can be used with MPLS-TE. FRR does not support a complete RSVP-TE solution currently. mpls-te on no mpls-te Enable Traffic Engineering LSP flooding. mpls-te router-address no mpls-te router-address Configure stable IP address for MPLS-TE. show isis mpls-te interface show isis mpls-te interface INTERFACE Show MPLS Traffic Engineering parameters for all or specified interface. show isis mpls-te router Show Traffic Engineering router parameters. See also: Traffic Engineering Debugging ISIS ============== debug isis adj-packets no debug isis adj-packets IS-IS Adjacency related packets. debug isis checksum-errors no debug isis checksum-errors IS-IS LSP checksum errors. debug isis events no debug isis events IS-IS Events. debug isis local-updates no debug isis local-updates IS-IS local update packets. debug isis packet-dump no debug isis packet-dump IS-IS packet dump. debug isis protocol-errors no debug isis protocol-errors IS-IS LSP protocol errors. debug isis route-events no debug isis route-events IS-IS Route related events. debug isis snp-packets no debug isis snp-packets IS-IS CSNP/PSNP packets. debug isis spf-events debug isis spf-statistics debug isis spf-triggers no debug isis spf-events no debug isis spf-statistics no debug isis spf-triggers IS-IS Shortest Path First Events, Timing and Statistic Data and triggering events. debug isis update-packets no debug isis update-packets Update related packets. show debugging isis Print which ISIS debug level is activate. ISIS Configuration Examples =========================== A simple example, with MD5 authentication enabled: ! interface eth0 ip router isis FOO isis network point-to-point isis circuit-type level-2-only ! router isis FOO net 47.0023.0000.0000.0000.0000.0000.0000.1900.0004.00 metric-style wide is-type level-2-only A Traffic Engineering configuration, with Inter-ASv2 support. First, the "zebra.conf" part: hostname HOSTNAME password PASSWORD log file /var/log/zebra.log ! interface eth0 ip address 10.2.2.2/24 link-params max-bw 1.25e+07 max-rsv-bw 1.25e+06 unrsv-bw 0 1.25e+06 unrsv-bw 1 1.25e+06 unrsv-bw 2 1.25e+06 unrsv-bw 3 1.25e+06 unrsv-bw 4 1.25e+06 unrsv-bw 5 1.25e+06 unrsv-bw 6 1.25e+06 unrsv-bw 7 1.25e+06 admin-grp 0xab ! interface eth1 ip address 10.1.1.1/24 link-params enable metric 100 max-bw 1.25e+07 max-rsv-bw 1.25e+06 unrsv-bw 0 1.25e+06 unrsv-bw 1 1.25e+06 unrsv-bw 2 1.25e+06 unrsv-bw 3 1.25e+06 unrsv-bw 4 1.25e+06 unrsv-bw 5 1.25e+06 unrsv-bw 6 1.25e+06 unrsv-bw 7 1.25e+06 neighbor 10.1.1.2 as 65000 Then the "isisd.conf" itself: hostname HOSTNAME password PASSWORD log file /var/log/isisd.log ! ! interface eth0 ip router isis FOO ! interface eth1 ip router isis FOO ! ! router isis FOO isis net 47.0023.0000.0000.0000.0000.0000.0000.1900.0004.00 mpls-te on mpls-te router-address 10.1.1.1 ! line vty