H3C S9500 Series Operation Manual
Is-is configuration routing switches
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Operation Manual - IS-IS
H3C S9500 Series Routing Switches
Chapter 1 IS-IS Configuration ...................................................................................................... 1-1
1.1 IS-IS Overview ................................................................................................................... 1-1
1.1.1 Basic Concepts ....................................................................................................... 1-1
1.1.2 IS-IS Area................................................................................................................ 1-4
1.1.3 IS-IS Network Type ................................................................................................. 1-6
1.1.4 IS-IS PDU Format ................................................................................................... 1-8
1.1.5 IS-IS Features Supported ..................................................................................... 1-15
1.1.6 Protocols and Standards....................................................................................... 1-18
1.2 IS-IS Configuration Task List ........................................................................................... 1-19
1.3 Configuring IS-IS Basic Functions ................................................................................... 1-19
1.3.1 Configuration Prerequisites................................................................................... 1-19
1.3.2 Configuration Procedure ....................................................................................... 1-20
1.4 Configuring IS-IS Routing Information Control ................................................................ 1-21
1.4.1 Configuration Prerequisites................................................................................... 1-21
1.4.2 Specifying a Priority for IS-IS ................................................................................ 1-21
1.4.3 Configuring IS-IS Link Cost................................................................................... 1-21
1.4.4 Configuring the Maximum Number of Equal Cost Routes .................................... 1-23
1.4.5 Configuring IS-IS Route Summarization ............................................................... 1-24
1.4.6 Advertising a Default Route .................................................................................. 1-24
1.4.7 Configuring Inbound Route Filtering ..................................................................... 1-25
1.4.8 Configuring Route Redistribution .......................................................................... 1-25
1.4.9 Configuring IS-IS Route Leaking........................................................................... 1-25
1.5 Tuning and Optimizing IS-IS Network ............................................................................. 1-26
1.5.1 Configuration Prerequisites................................................................................... 1-26
1.5.2 Configuring a DIS Priority for an Interface ............................................................ 1-26
1.5.3 Configuring IS-IS Timers....................................................................................... 1-27
1.5.4 Disabling an Interface from Sending/Receiving IS-IS Hello Packets.................... 1-28
1.5.5 Configuring LSP Parameters ................................................................................ 1-28
1.5.6 Configuring SPF Parameters ................................................................................ 1-30
1.5.7 Configuring Dynamic Host Name Mapping........................................................... 1-31
1.5.8 Configuring IS-IS Authentication ........................................................................... 1-32
1.5.9 Configuring LSDB Overload Tag........................................................................... 1-33
1.5.10 Logging the Adjacency Changes ........................................................................ 1-33
1.5.11 Enabling an Interface to Send Small Hello Packets............................................ 1-34
1.5.12 Enabling IS-IS SNMP Trap ................................................................................. 1-34
1.6 Displaying and Maintaining IS-IS Configuration .............................................................. 1-34
1.7 IS-IS Configuration Examples.......................................................................................... 1-35
1.7.1 IS-IS Basic Configuration ...................................................................................... 1-35
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Page 1: Table Of Contents
Operation Manual – IS-IS H3C S9500 Series Routing Switches Table of Contents Table of Contents Chapter 1 IS-IS Configuration ...................... 1-1 1.1 IS-IS Overview ........................1-1 1.1.1 Basic Concepts ....................... 1-1 1.1.2 IS-IS Area........................ 1-4 1.1.3 IS-IS Network Type ....................1-6 1.1.4 IS-IS PDU Format .................... - Page 2 Operation Manual – IS-IS H3C S9500 Series Routing Switches Table of Contents 1.7.2 DIS Selection Configuration .................. 1-41...
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Page 3: Chapter 1 Is-Is Configuration
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Chapter 1 IS-IS Configuration When configuring IS-IS, go to these sections for information you are interested in: IS-IS Overview IS-IS Configuration Task List Configuring IS-IS Basic Functions... - Page 4 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Routing domain (RD). A group of ISs exchange routing information with the same routing protocol in a routing domain. Area. An area is a division unit in a routing domain. The IS-IS protocol allows a routing domain to be divided into multiple areas.
- Page 5 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Generally, a router only needs one area address, and all nodes in the same routing domain must share the same area address. However, a router can have three area addresses at most to support smooth area merging, partitioning and switching.
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Page 6: Is-Is Area
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration 1.1.2 IS-IS Area I. Two-level hierarchy IS-IS uses two-level hierarchy in the routing domain to support large scale routing networks. A large routing domain is divided into multiple Areas. The Level-1 router is in charge of forwarding routes within an area, and the Level-2 router is in charge of forwarding routes between areas. - Page 7 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Figure 1-2 IS-IS topology Figure 1-3 shows another network topology running the IS-IS protocol. The Level-1-2 routers connect the Level-1 and Level-2 routers, and also form the IS-IS backbone together with the Level-2 routers.
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Page 8: Is-Is Network Type
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Both the Level-1 and Level-2 routers use the SPF algorithm to generate the Shortest Path Tree (SPT). III. Interface routing hierarchy type You can configure the routing type for each interface. For a Level-1-2 router, one interface may establish Level-1 adjacency with a router, and another one may establish Level-2 adjacency with another router. - Page 9 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Note: For the Non-Broadcast Multi-Access (NBMA) network, such as ATM, you need to configure point-to-point or broadcast network on its configured subinterfaces. IS-IS does not run on Point to Multipoint (P2MP) links.
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Page 10: Is-Is Pdu Format
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Note: On IS-IS broadcast networks, all routers are adjacent with each other. The DIS is responsible for the synchronization of their LSDBs. 1.1.4 IS-IS PDU Format I. PDU header format The IS-IS packets are encapsulated into link layer frames. - Page 11 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Maximum Area Address: Maximum number of area addresses supported. Table 1-1 PDU type Type PDU Type Acronym Level-1 LAN IS-IS hello PDU L1 LAN IIH Level-2 LAN IS-IS hello PDU...
- Page 12 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Figure 1-7 L1/L2 LAN IIH format Reserved/Circuit Type: The first 6 bits are reserved with value 0. The last 2 bits indicates router types: 00 means reserved, 01 indicates L1, 10 indicates L2, and 11 indicates L1/2.
- Page 13 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Figure 1-8 P2P IIH format Instead of the priority and LAN ID fields in the LAN IIH, the P2P IIH has a Local Circuit ID field. IV. LSP packet format The Link State PDUs (LSP) carries link state information.
- Page 14 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Figure 1-9 L1/L2 LSP format PDU Length: Total length of the PDU in bytes. Remaining Lifetime: LSP remaining lifetime in seconds. LSP ID: Consists of the system ID, the pseudonode ID (one byte) and the LSP fragment number (one byte).
- Page 15 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Figure 1-10 LSDB overload IS Type: Type of the router generating the LSP. V. SNP format The Sequence Number PDU (SNP) confirms the latest received LSPs. It is similar to the Acknowledge packet, but more efficient.
- Page 16 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration PSNP only contains the sequence numbers of one or multiple latest received LSPs. It can acknowledge multiple LSPs at one time. When LSDBs are not synchronized, a PSNP is used to request new LSPs from neighbors.
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Page 17: Is-Is Features Supported
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration CLV Code Name PDU Type LSP Entries Authentication Information IIH, LSP, SNP IP Internal Reachability Information Protocols Supported IIH, LSP IP External Reachability Information L2 LSP Inter-Domain Routing Protocol Information... - Page 18 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Note: For detailed information about the GR configuration, refer to GR configuration in the System Volume. For detailed information about the IS-IS hot standby configuration, refer to HA configuration in the System Volume.
- Page 19 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration the MTUs of all the IS-IS interfaces must not be less than 512; otherwise, LSP fragment extension will not take effect. Terms Originating System It is the router actually running IS-IS. After LSP fragment extension is enabled, additional virtual systems can be configured for the router.
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Page 20: Protocols And Standards
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Mode-2: Applicable to a network where all the routers support LSP fragment extension. In this mode, all the IS-IS routers know which virtual system belongs to which originating system; therefore, no limitation is imposed on the link state information of the extended LSP fragments advertised by the virtual systems. -
Page 21: Is-Is Configuration Task List
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration 1.2 IS-IS Configuration Task List Complete the following tasks to configure IS-IS: Task Remarks Configuring IS-IS Basic Functions Required Specifying a Priority for IS-IS Optional Configuring IS-IS Link Cost... -
Page 22: Configuration Procedure
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration 1.3.2 Configuration Procedure Follow these steps to configure IS-IS basic functions: To do… Use the command… Remarks Enter system view system-view –– isis [ process-id ] Required... -
Page 23: Configuring Is-Is Routing Information Control
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Note: You need to enable the IS-IS process, specify a NET, and enable IS-IS on the interface before configuring or validating other functions. If a router’s type is configured as Level-1 or Level-2, the type of interfaces must be the same, and cannot be changed with the isis circuit-level command. - Page 24 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration I. Configure an IS-IS cost for an interface Follow these steps to configure an interface’s cost: To do… Use the command… Remarks Enter system view system-view ––...
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Page 25: Configuring The Maximum Number Of Equal Cost Routes
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration To do… Use the command… Remarks cost-style { narrow | wide | Optional wide-compatible | { compatible Specify an IS-IS cost style | narrow-compatible } narrow by default... -
Page 26: Configuring Is-Is Route Summarization
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration 1.4.5 Configuring IS-IS Route Summarization This task is to configure a summary route, so routes falling into the network range of the summary route are summarized with one route for advertisement. Doing so can reduce the size of routing tables, as well as the LSP and LSDB generated by the router itself. -
Page 27: Configuring Inbound Route Filtering
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration 1.4.7 Configuring Inbound Route Filtering Follow these steps to configure inbound route filtering: To do… Use the command… Remarks Enter system view system-view –– isis [ process-id ] [ vpn-instance Enter IS-IS view ––... -
Page 28: Tuning And Optimizing Is-Is Network
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration To do… Use the command… Remarks Enter system view system-view –– isis [ process-id ] [ vpn-instance Enter IS-IS view –– vpn-instance-name ] import-route isis level-2 into level-1... -
Page 29: Configuring Is-Is Timers
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Note: If multiple routers in the broadcast network have the same highest DIS priority, the router with the highest MAC address becomes the DIS. This rule applies even all routers’... -
Page 30: Disabling An Interface From Sending/Receiving Is-Is Hello Packets
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Note: On the broadcast link, you can specify different intervals for Level-1 and Level-2 hello packets; if no level is specified, the interval applies to both Level-1 and Level-2 hello packets, but only takes effect on the level of the current process;... - Page 31 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration The router will discard an LSP with incorrect checksum. You can configure the router to ignore the incorrect checksum, which means an LSP will be processed even with an incorrect LSP checksum.
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Page 32: Configuring Spf Parameters
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration To do… Use the command… Remarks Optional Not added by default isis mesh-group Add the interface to a If the mesh-blocked [ mesh-group-number | mesh group keyword is included, the... -
Page 33: Configuring Dynamic Host Name Mapping
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration To do… Use the command... Remarks Optional Specify the SPF Not specified by default spf-slice-size duration-time calculation duration By default, the SPF calculation time is not split. -
Page 34: Configuring Is-Is Authentication
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration 1.5.8 Configuring IS-IS Authentication For area authentication, the area authentication password is encapsulated into the Level-1 LSP, CSNP, and PSNP packets. On area authentication enabled routers in the same area, the authentication mode and password must be same. -
Page 35: Configuring Lsdb Overload Tag
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration Note: The level-1 and level-2 keywords in the isis authentication-mode command are only supported on the Ethernet interface, and the interface must be configured with the isis enable command first. -
Page 36: Enabling An Interface To Send Small Hello Packets
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration 1.5.11 Enabling an Interface to Send Small Hello Packets Follow these steps to enable an interface to send small hello packets (without the padding field): To do…... -
Page 37: Is-Is Configuration Examples
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration To do… Use the command… Remarks display isis lsdb [ [ l1 | l2 | level-1 | level-2 ] | [ lsp-id LSPID | lsp-name Display IS-IS LSDB... - Page 38 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration II. Network diagram Figure 1-14 Network diagram for IS-IS basic configuration III. Configuration procedure Configure IP addresses for interfaces (omitted) Configure IS-IS # Configure Switch A. <SwitchA> system-view...
- Page 39 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration [SwitchC] interface vlan-interface 100 [SwitchC-Vlan-interface100] isis enable 1 [SwitchC-Vlan-interface100] quit [SwitchC] interface vlan-interface 200 [SwitchC-Vlan-interface200] isis enable 1 [SwitchC-Vlan-interface200] quit [SwitchC] interface vlan-interface 300 [SwitchC-Vlan-interface300] isis enable 1 [SwitchC-Vlan-interface300] quit # Configure Switch D.
- Page 40 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration [SwitchB] display isis lsdb Database information for ISIS(1) -------------------------------- Level-1 Link State Database LSPID Seq Num Checksum Holdtime Length ATT/P/OL -------------------------------------------------------------------------- 0000.0000.0001.00-00 0x00000006 0xdb60 0/0/0 0000.0000.0002.00-00* 0x00000008...
- Page 41 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration *-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-Overload [SwitchD] display isis lsdb Database information for ISIS(1) -------------------------------- Level-2 Link State Database LSPID Seq Num Checksum Holdtime Length ATT/P/OL...
- Page 42 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration ISIS(1) IPv4 Level-1 Forwarding Table ------------------------------------- IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags -------------------------------------------------------------------------- 192.168.0.0/24 NULL Vlan300 Direct R/L/- 10.1.1.0/24 NULL Vlan100 Direct R/L/- 10.1.2.0/24 NULL Vlan200...
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Page 43: Dis Selection Configuration
Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration 1.7.2 DIS Selection Configuration I. Network requirements As shown in the following figure, Switch A, Switch B, Switch C and Switch D reside in IS-IS area 10 on a broadcast network (Ethernet). Switch A and Switch B are Level-1-2 switches, Switch C is a Level-1 switch, and Switch D is a Level-2 switch. - Page 44 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration [SwitchB-Vlan-interface100] isis enable 1 [SwitchB-Vlan-interface100] quit # Configure Switch C. <SwitchC> system-view [SwitchC] isis 1 [SwitchC-isis-1] network-entity 10.0000.0000.0003.00 [SwitchC-isis-1] is-level level-1 [SwitchC-isis-1] quit [SwitchC] interface vlan-interface 100...
- Page 45 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration # Display information about IS-IS interfaces of Switch A. [SwitchA] display isis interface Interface information for ISIS(1) --------------------------------- Interface: Vlan-interface100 IPV4.State IPV6.State Type Down 1497 L1/L2 No/No # Display information about IS-IS interfaces of Switch C.
- Page 46 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration ---------------------------- System Id: 0000.0000.0002 Interface: Vlan-interface100 Circuit Id: 0000.0000.0001.01 State: Up HoldTime: 21s Type: L1(L1L2) PRI: 64 System Id: 0000.0000.0003 Interface: Vlan-interface100 Circuit Id: 0000.0000.0001.01 State: Up...
- Page 47 Operation Manual – IS-IS H3C S9500 Series Routing Switches Chapter 1 IS-IS Configuration System Id: 0000.0000.0001 Interface: Vlan-interface100 Circuit Id: 0000.0000.0001.01 State: Up HoldTime: 7s Type: L1 PRI: 100 [SwitchC] display isis interface Interface information for ISIS(1) --------------------------------- Interface: Vlan-interface100 IPV4.State...