HP 5500 Ei 5500 Si Switch Series Configuration Guide

 122 
You can enable OSPF FRR to either automatically calculate a backup next hop, or to designate a 
backup next hop by using a routing policy. 
Method I: Enable OSPF FRR to automatically calculate the backup next hop.  
# Configure Switch S.  
 system-view 
[SwitchS] bfd echo-source-ip 1.1.1.1 
[SwitchS] ospf 1 
[SwitchS-ospf-1] fast-reroute auto 
[SwitchS-ospf-1] quit 
# Configure Switch D.  
 system-view 
[SwitchD] bfd echo-source-ip 4.4.4.4 
[SwitchD] ospf 1 
[SwitchD-ospf-1] fast-reroute auto...

 123 
     Protocol: OSPF            Process ID: 1 
   Preference: 10                    Cost: 1 
 IpPrecedence:                    QosLcId: 
      NextHop: 13.13.13.2       Interface: Vlan-interface200 
    BkNextHop: 12.12.12.2     BkInterface: Vlan-interface100 
  RelyNextHop: 0.0.0.0          Neighbor : 0.0.0.0 
    Tunnel ID: 0x0                  Label: NULL 
  BKTunnel ID: 0x0                BKLabel: NULL 
        State: Active Adv             Age: 00h01m27s 
          Tag: 0 
# Display route...

 124 
Figure 48 Network diagram 
 
Device Interface IP address Device Interface IP address 
Switch A  Vlan-int10  10.1.0.102/24  Switch B  Vlan-int10  10.1.0.100/24 
 Vlan-int11 11.1.1.1/24  Vlan-int13 13.1.1.1/24 
Switch C  Vlan-int11  11.1.1.2/24    
 Vlan-int13 13.1.1.2/24     
Configuration procedure 
1. Configure IP addresses for inte rfaces. (Details not shown.) 
2. Configure OSPF basic functions: 
# Configure Switch A. 
 system-view 
[SwitchA] ospf 
[SwitchA-ospf-1] area 0...

 125 
[SwitchC] ospf 
[SwitchC-ospf-1] area 0 
[SwitchC-ospf-1-area-0.0.0.0] network 11.1.1.0 0.0.0.255 
[SwitchC-ospf-1-area-0.0.0.0] network 13.1.1.0 0.0.0.255 
[SwitchC-ospf-1-area-0.0.0.0] quit 
[SwitchC-ospf-1] quit 
3. Configure BFD:  
# Enable BFD on Switch A and configure BFD parameters.  
[SwitchA] bfd session init-mode active 
[SwitchA] interface vlan-interface 10 
[SwitchA-Vlan-interface10] ospf bfd enable 
[SwitchA-Vlan-interface10] bfd min-transmit-interval 500 
[SwitchA-Vlan-interface10]...

 126 
          Tag: 0 
  Destination: 120.1.1.0/24 
     Protocol: OSPF            Process ID: 1 
   Preference: 10                    Cost: 4 
 IpPrecedence:                    QosLcId: 
      NextHop: 10.1.1.100       Interface: Vlan-interface11 
    BkNextHop: 0.0.0.0        BkInterface: 
  RelyNextHop: 0.0.0.0          Neighbor : 0.0.0.0 
    Tunnel ID: 0x0                  Label: NULL 
  BKTunnel ID: 0x0                BKLabel: NULL 
        State: Invalid Adv            Age: 00h58m05s...

 127 
The BFD session between Switch A and Switch B is deleted and no information is output.  
 display bfd session 
# Display routes to 120.1.1.0/24 on Switch A, an d you can see that Switch A communicates with 
Switch B through Switch C.  
 display ip routing-table 120.1.1.0 verbose 
Routing Table : Public 
Summary Count : 2 
  Destination: 120.1.1.0/24 
     Protocol: OSPF            Process ID: 1 
   Preference: 10                    Cost: 4 
 IpPrecedence:                    QosLcId: 
      NextHop:...

 128 
5.
 
On an NBMA network, using the  peer ip-address command to specify the neighbor manually is 
required. 
6.  On an NBMA or a broadcast network, at least one connected interfac e must have a router priority 
higher than 0. 
Incorrect routing information 
Symptom 
OSPF cannot find routes to other areas. 
Analysis 
The backbone area must maintain connectivity to all ot her areas. If a router connects to more than one 
area, at least one area must be connected to the backbone. The backbone cannot be...

 129 
Configuring IS-IS 
Hardware compatibility 
The HP 5500 SI Switch Series does not support IS-IS. 
IS-IS overview 
Intermediate System-to-Intermediate System (IS-IS) is a dynamic routing protocol designed by the 
International Organization for Standardization (ISO) to operate on the connectionless network protocol 
(CLNP). 
The IS-IS routing protocol was modified and extended in RFC 1 195 by the International Engineer Task 
Force (IETF) for application in both TCP/IP and OSI reference models, and the...

 130 
IS-IS address format 
•  NSAP 
As shown in  Figure 49, an NSAP address c
 onsists of the Initial Domain Part (IDP) and the Domain 
Specific Part (DSP). The IDP is equal to the network ID of an IP address, and the DSP is equal to the 
subnet and host ID. 
The IDP includes the Authority and Format Identifier  (AFI) and the Initial Domain Identifier (IDI). 
The DSP includes the High Order Part of DSP (HO-DSP), System ID, and SEL, where the HO-DSP 
identifies the area, the System ID identifies the...

 131 
NET 
A network entity title (NET) indicates the network layer information of an IS, and does not include 
transport layer information. It is a special NSAP address with the SEL being 0. The length of the NET is 
equal to the NSAP, and is in the range of 8 bytes to 20 bytes. 
A NET comprises the following parts: 
•  Area ID —Its length is in the range of 1 to 13 bytes. 
•   System ID —A system ID uniquely identifies a host or router in the area and has a fixed 6-byte 
length.  
•   SEL—It has a...