OSPF GR configuration example

As shown in Figure 31:

• Switch A, Switch B, and Switch C that belong to the same AS and the same OSPF routing domain are GR capable.

• Switch A acts as the non-IETF GR restarter. Switch B and Switch C are the GR helpers, and synchronize their LSDBs with Switch A through OOB communication of GR.

1. Configure IP addresses for interfaces. (Details not shown.)

2. Enable OSPF:

   # Configure Switch A.

   SwitchA> system-view
   [SwitchA] router id 1.1.1.1
   [SwitchA] ospf 100
   [SwitchA-ospf-100] area 0
   [SwitchA-ospf-100-area-0.0.0.0] network 192.1.1.0 0.0.0.255
   [SwitchA-ospf-100-area-0.0.0.0] quit
   [SwitchA-ospf-1] quit
   

   # Configure Switch B.

   <SwitchB> system-view
   [SwitchB] router id 2.2.2.2
   [SwitchB] ospf 100
   [SwitchB-ospf-100] area 0
   [SwitchB-ospf-100-area-0.0.0.0] network 192.1.1.0 0.0.0.255
   [SwitchB-ospf-100-area-0.0.0.0] quit
   [SwitchB-ospf-1] quit
   

   # Configure Switch C.

   <SwitchC> system-view
   [SwitchC] router id 3.3.3.3
   [SwitchC] ospf 100
   [SwitchC-ospf-100] area 0
   [SwitchC-ospf-100-area-0.0.0.0] network 192.1.1.0 0.0.0.255
   [SwitchC-ospf-100-area-0.0.0.0] quit
   [SwitchC-ospf-1] quit
   

3. Configure OSPF GR:

   # Configure Switch A as the non-IETF OSPF GR restarter: enable the link-local signaling capability, the out-of-band re-synchronization capability, and non-IETF GR capability for OSPF process 100.

   [SwitchA-ospf-100] enable link-local-signaling
   [SwitchA-ospf-100] enable out-of-band-resynchronization
   [SwitchA-ospf-100] graceful-restart
   [SwitchA-ospf-100] quit
   

   # Configure Switch B as the GR helper: enable the link-local signaling capability and the out-of-band re-synchronization capability for OSPF process 100.

   [SwitchB-ospf-100] enable link-local-signaling
   [SwitchB-ospf-100] enable out-of-band-resynchronization
   

   # Configure Switch C as the GR helper: enable the link-local signaling capability and the out-of-band re-synchronization capability for OSPF process 100.

   [SwitchC-ospf-100] enable link-local-signaling
   [SwitchC-ospf-100] enable out-of-band-resynchronization
   

# Enable OSPF GR event debugging and restart the OSPF process by using GR on Switch A.

<SwitchA> debugging ospf event graceful-restart
<SwitchA> terminal monitor
<SwitchA> terminal logging level 7
<SwitchA> reset ospf 100 process graceful-restart
Reset OSPF process? [Y/N]:y
%Oct 21 15:29:28:727 2011 SwitchA OSPF/5/OSPF_NBR_CHG: -MDC=1; OSPF 100 Neighbor 192.1.1.2(Vlan-interface100) from Full to Down.
%Oct 21 15:29:28:729 2011 SwitchA OSPF/5/OSPF_NBR_CHG: -MDC=1; OSPF 100 Neighbor 192.1.1.3(Vlan-interface100) from Full to Down.
*Oct 21 15:29:28:735 2011 SwitchA OSPF/7/DEBUG: -MDC=1;
OSPF 100 nonstandard GR Started for OSPF Router
*Oct 21 15:29:28:735 2011 SwitchA OSPF/7/DEBUG: -MDC=1;
OSPF 100 created GR wait timer,timeout interval is 40(s).
*Oct 21 15:29:28:735 2011 SwitchA OSPF/7/DEBUG: -MDC=1;
OSPF 100 created GR Interval timer,timeout interval is 120(s).
*Oct 21 15:29:28:758 2011 SwitchA OSPF/7/DEBUG: -MDC=1;
OSPF 100 created OOB Progress timer for neighbor 192.1.1.3.
*Oct 21 15:29:28:766 2011 SwitchA OSPF/7/DEBUG: -MDC=1;
OSPF 100 created OOB Progress timer for neighbor 192.1.1.2.
%Oct 21 15:29:29:902 2011 SwitchA OSPF/5/OSPF_NBR_CHG: -MDC=1; OSPF 100 Neighbor 192.1.1.2(Vlan-interface100) from Loading to Full.
*Oct 21 15:29:29:902 2011 SwitchA OSPF/7/DEBUG: -MDC=1;
OSPF 100 deleted OOB Progress timer for neighbor 192.1.1.2.
%Oct 21 15:29:30:897 2011 SwitchA OSPF/5/OSPF_NBR_CHG: -MDC=1; OSPF 100 Neighbor 192.1.1.3(Vlan-interface100) from Loading to Full.
*Oct 21 15:29:30:897 2011 SwitchA OSPF/7/DEBUG: -MDC=1;
OSPF 100 deleted OOB Progress timer for neighbor 192.1.1.3.
*Oct 21 15:29:30:911 2011 SwitchA OSPF/7/DEBUG: -MDC=1;
OSPF GR: Process 100 Exit Restart,Reason : DR or BDR change,for neighbor : 192.1.1.3.
*Oct 21 15:29:30:911 2011 SwitchA OSPF/7/DEBUG: -MDC=1;
OSPF 100 deleted GR Interval timer.
*Oct 21 15:29:30:912 2011 SwitchA OSPF/7/DEBUG: -MDC=1;
OSPF 100 deleted GR wait timer.
%Oct 21 15:29:30:920 2011 SwitchA OSPF/5/OSPF_NBR_CHG: -MDC=1; OSPF 100 Neighbor 192.1.1.2(Vlan-interface100) from Full to Down.
%Oct 21 15:29:30:921 2011 SwitchA OSPF/5/OSPF_NBR_CHG: -MDC=1; OSPF 100 Neighbor 192.1.1.3(Vlan-interface100) from Full to Down.
%Oct 21 15:29:33:815 2011 SwitchA OSPF/5/OSPF_NBR_CHG: -MDC=1; OSPF 100 Neighbor 192.1.1.3(Vlan-interface100) from Loading to Full.
%Oct 21 15:29:35:578 2011 SwitchA OSPF/5/OSPF_NBR_CHG: -MDC=1; OSPF 100 Neighbor 192.1.1.2(Vlan-interface100) from Loading to Full.

The output shows that Switch A completes GR.