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H3C S9500 Series Operation Manual - page 36
Operation Manual – IS-IS
H3C S9500 Series Routing Switches
Chapter 1 IS-IS Configuration
1-34
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…
Use the command…
Remarks
Enter system view
system-view
––
Enter interface view
interface interface-type
interface-number
––
Enable the interface to
send small hello packets
that have no padding field
isis small-hello
Required
Standard hello packets
are sent by default.
1.5.12 Enabling IS-IS SNMP Trap
Follow these steps to enable IS-IS SNMP trap:
To do…
Use the command…
Remarks
Enter system view
system-view
––
Enter IS-IS view
isis [ process-id ]
[ vpn-instance
vpn-instance-name ]
––
Enable IS-IS SNMP trap
is-snmp-traps enable
Required
Enabled by default
1.6 Displaying and Maintaining IS-IS Configuration
To do…
Use the command…
Remarks
Display brief IS-IS
information
display isis brief [ process-id |
vpn-instance vpn-instance-name ]
Available in any
view
Display the status of the
debug switch
display isis debug-switches
{process-id | vpn-instance
vpn-instance-name}
Available in any
view
Display information about
IS-IS enabled interfaces
display isis interface
[ [ traffic-eng | verbose ] * |
tunnel ] [process-id |
vpn-instance vpn-instance-name]
Available in any
view
Display IS-IS license
information
display isis license
Available in any
view
Summary of S9500 Series
Page 1
Operation manual – is-is h3c s9500 series routing switches table of contents i table of contents chapter 1 is-is configuration ...................................................................................................... 1-1 1.1 is-is overview ..................................................
Page 2
Operation manual – is-is h3c s9500 series routing switches table of contents ii 1.7.2 dis selection configuration .................................................................................. 1-41.
Page 3
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-1 chapter 1 is-is configuration when configuring is-is, go to these sections for information you are interested in: z is-is overview z is-is configuration task list z configuring is-is basic functions z config...
Page 4
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-2 z routing domain (rd). A group of iss exchange routing information with the same routing protocol in a routing domain. Z area. An area is a division unit in a routing domain. The is-is protocol allows a rout...
Page 5
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-3 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 merg...
Page 6
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-4 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...
Page 7
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-5 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 t...
Page 8
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-6 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...
Page 9
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-7 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 (p2m...
Page 10
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-8 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 e...
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Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-9 z maximum area address: maximum number of area addresses supported. Table 1-1 pdu type type pdu type acronym 15 level-1 lan is-is hello pdu l1 lan iih 16 level-2 lan is-is hello pdu l2 lan iih 17 point-to-po...
Page 12
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-10 figure 1-7 l1/l2 lan iih format z 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 indic...
Page 13
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-11 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. ...
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Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-12 figure 1-9 l1/l2 lsp format z pdu length: total length of the pdu in bytes. Z remaining lifetime: lsp remaining lifetime in seconds. Z lsp id: consists of the system id, the pseudonode id (one byte) and the...
Page 15
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-13 figure 1-10 lsdb overload z 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 e...
Page 16
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-14 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 neighb...
Page 17
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-15 clv code name pdu type 9 lsp entries snp 10 authentication information iih, lsp, snp 128 ip internal reachability information lsp 129 protocols supported iih, lsp 130 ip external reachability information l2...
Page 18
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-16 note: z for detailed information about the gr configuration, refer to gr configuration in the system volume. Z for detailed information about the is-is hot standby configuration, refer to ha configuration i...
Page 19
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-17 the mtus of all the is-is interfaces must not be less than 512; otherwise, lsp fragment extension will not take effect. 1) terms z originating system it is the router actually running is-is. After lsp fragm...
Page 20
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-18 z 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 limit...
Page 21
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-19 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 cos...
Page 22
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-20 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 –– enable an is-is process and enter its view isis [ proces...
Page 23
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-21 note: z you need to enable the is-is process, specify a net, and enable is-is on the interface before configuring or validating other functions. Z if a router’s type is configured as level-1 or level-2, the...
Page 24
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-22 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 –– enter is-is view isis [ process-id ] [ vpn-i...
Page 26
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-24 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...
Page 27
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-25 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 –– enter is-is view isis [ process-id ] [ vpn...
Page 28
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-26 to do… use the command… remarks enter system view system-view –– enter is-is view isis [ process-id ] [ vpn-instance vpn-instance-name ] –– enable is-is route leaking import-route isis level-2 into level-1 ...
Page 29
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-27 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’ dis priority is 0. 1.5.3 c...
Page 30
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-28 note: z 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 t...
Page 31
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-29 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. On the nbma n...
Page 33
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-31 to do… use the command... Remarks specify the spf calculation duration spf-slice-size duration-time optional not specified by default by default, the spf calculation time is not split. 1.5.7 configuring dyn...
Page 34
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-32 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 s...
Page 35
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-33 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. 1.5.9 co...
Page 36
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-34 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… use the command… remarks enter system view ...
Page 38
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-36 ii. Network diagram figure 1-14 network diagram for is-is basic configuration iii. Configuration procedure 1) configure ip addresses for interfaces (omitted) 2) configure is-is # configure switch a. System-...
Page 39
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-37 [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-vl...
Page 40
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-38 [switchb] display isis lsdb database information for isis(1) -------------------------------- level-1 link state database lspid seq num checksum holdtime length att/p/ol ------------------------------------...
Page 41
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-39 *-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 n...
Page 42
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-40 isis(1) ipv4 level-1 forwarding table ------------------------------------- ipv4 destination intcost extcost exitinterface nexthop flags ---------------------------------------------------------------------...
Page 43
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-41 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 ...
Page 44
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-42 [switchb-vlan-interface100] isis enable 1 [switchb-vlan-interface100] quit # configure switch c. System-view [switchc] isis 1 [switchc-isis-1] network-entity 10.0000.0000.0003.00 [switchc-isis-1] is-level l...
Page 45
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-43 # display information about is-is interfaces of switch a. [switcha] display isis interface interface information for isis(1) --------------------------------- interface: vlan-interface100 id ipv4.State ipv6...
Page 46
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-44 ---------------------------- 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-int...
Page 47
Operation manual – is-is h3c s9500 series routing switches chapter 1 is-is configuration 1-45 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) -------------...