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PIM6d-Down interface selected as mroute IIF #13036

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vijaykug opened this issue Mar 18, 2023 · 2 comments
Closed

PIM6d-Down interface selected as mroute IIF #13036

vijaykug opened this issue Mar 18, 2023 · 2 comments
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@SaiGomathiN
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pimv6 triage Needs further investigation

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@vijaykug
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vijaykug commented Mar 18, 2023 •
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Issue - while writing topotest , i have observed that (*,G) mroute IIF is selected down interfaces , because of that join is not reaching to RP

Setup

+-------------------------------+  
 |.                                                     |
R1(LHR)-----R2(RP)------R4(FHR)
 |                                                      |
 +-------------R3---------------+

Step to repro :-

  1. Above topology initially R1 to R2 links are down
  2. ens161.4005 selected mroute IIF
  3. Had shut parent interface ( i.6. ens161 ) from R1
  4. No shut R1 to R4 path first and than R1 to R2
  5. Observed that Morute IIF still pointing to down link

Note - I tried same steps 2 times , but unable to reproduce the issue

R11(config)# do show ipv6 mroute 
IP Multicast Routing Table
Flags: S - Sparse, C - Connected, P - Pruned
       R - SGRpt Pruned, F - Register flag, T - SPT-bit set
 Source  Group    Flags  Proto  Input        Output  TTL  Uptime    
 *       ff05::2  SC     MLD    ens161.4005  ens225  1    00:22:28  
 *       ffaa::1  SC     MLD    ens161.4005  ens225  1    00:22:28  
 *       ffaa::2  SC     MLD    ens161.4005  ens225  1    00:22:28  
 *       ffaa::3  SC     MLD    ens161.4005  ens225  1    00:22:28  
 *       ffaa::4  SC     MLD    ens161.4005  ens225  1    00:22:28  
 *       ffaa::5  SC     MLD    ens161.4005  ens225  1    00:22:28  

R11(config)# do show interface ens161.4005
Interface ens161.4005 is down
  Link ups:       2    last: 2023/03/18 05:01:23.60
  Link downs:     1    last: 2023/03/18 05:02:32.58
  vrf: default
  index 21 metric 0 mtu 1500 speed 10000 
  flags: <BROADCAST,MULTICAST>
  Type: Ethernet
  HWaddr: 00:50:56:b7:df:1b
  inet 21.1.1.1/24
  Interface Type Vlan
  Interface Slave Type None
  VLAN Id 4005
  protodown: off 
  Parent interface: ens161
R11(config)# do show ip pim interface 
 Interface    State  Address          PIM Nbrs  PIM DR      FHR  IfChannels  
 ens161.4005  down   0.0.0.0          0         21.1.1.2    0    0           
 ens161.4006  down   0.0.0.0          0         21.2.1.2    0    0           
 ens161.4007  down   0.0.0.0          0         21.3.1.2    0    0           
 ens161.4008  down   0.0.0.0          0         21.4.1.2    0    0           
 ens192.4001  up     11.1.1.1         1         11.1.1.2    0    0           
 ens192.4002  up     11.2.1.1         1         11.2.1.2    0    0           
 ens192.4003  up     11.3.1.1         1         11.3.1.2    0    0           
 ens192.4004  up     11.4.1.1         1         11.4.1.2    0    0           
 ens193       down   0.0.0.0          0         69.0.0.10   0    0           
 ens225       up     175.1.1.1        0         local       0    5           
 ens256       up     25.25.25.1       0         local       0    0           
 ens257       up     29.29.29.1       1         29.29.29.2  0    0           
 lo           up     101.101.101.101  0         local       0    0           
 pimreg       up     0.0.0.0          0         local       0    0           

R11(config)# do show ipv6 pim interface 
 Interface    State  Address                   PIM Nbrs  PIM DR                    FHR  IfChannels  
 ens161.4005  down   ::                        0         fe80::250:56ff:feb7:540f  0    0           
 ens161.4006  down   ::                        0         fe80::250:56ff:feb7:540f  0    0           
 ens161.4007  down   ::                        0         fe80::250:56ff:feb7:540f  0    0           
 ens161.4008  down   ::                        0         fe80::250:56ff:feb7:540f  0    0           
 ens192.4001  up     fe80::250:56ff:feb7:867f  1         local                     0    0           
 ens192.4002  up     fe80::250:56ff:feb7:867f  1         local                     0    0           
 ens192.4003  up     fe80::250:56ff:feb7:867f  1         local                     0    0           
 ens192.4004  up     fe80::250:56ff:feb7:867f  1         local                     0    0           
 ens193       down   ::                        0         local                     0    0           
 ens225       up     fe80::250:56ff:feb7:19a6  0         local                     0    6           
 ens256       up     fe80::250:56ff:feb7:cbbc  0         local                     0    0           
 ens257       up     fe80::250:56ff:feb7:ebe2  1         local                     0    0           
 lo           up     ::                        0         local                     0    0           
 pim6reg      up     ::                        0         local                     0    0   

R11(config)# do show ipv6 pim rp-info 
 RP address  group/prefix-list  OIF          I am RP  Source  Group-Type  
 1222::1     ff00::/8           ens192.4001  no       Static  ASM         

R11(config)# do show ipv6 route 1222::1
Routing entry for 1222::1/128
  Known via "bgp", distance 20, metric 0, best
  Last update 00:27:26 ago
  * fe80::250:56ff:feb7:54ad, via ens192.4001, weight 1
  *
R11(config)# do show ipv6 pim nexthop
Number of registered addresses: 1
 Address  Interface    Nexthop                   
 1222::1  ens192.4001  fe80::250:56ff:feb7:54ad  

R11(config)# do show ipv6 pim neighbor 
 Interface    Neighbor                  Uptime    Holdtime  DR Pri  
 ens192.4001  fe80::250:56ff:feb7:54ad  00:28:29  00:01:16  1       
 ens192.4002  fe80::250:56ff:feb7:54ad  00:28:28  00:01:16  1       
 ens192.4003  fe80::250:56ff:feb7:54ad  00:28:28  00:01:16  1       
 ens192.4004  fe80::250:56ff:feb7:54ad  00:28:29  00:01:15  1       
 ens257       fe80::250:56ff:feb7:53    00:25:00  00:01:44  1       

R11(config)# do show ipv6 pim state 
Codes: J -> Pim Join, I -> MLD Report, S -> Source, * -> Inherited from (*,G), V -> VxLAN, M -> Muted
 Active  Source  Group    RPT  IIF          OIL                 
 1       *       ff05::2  y    ens161.4005  ens161.4005(I    )  
                                            ens225(I    )       
 1       *       ffaa::1  y    ens161.4005  ens161.4005(I    )  
                                            ens225(I    )       
 1       *       ffaa::2  y    ens161.4005  ens161.4005(I    )  
                                            ens225(I    )       
 1       *       ffaa::3  y    ens161.4005  ens161.4005(I    )  
                                            ens225(I    )       
 1       *       ffaa::4  y    ens161.4005  ens161.4005(I    )  
                                            ens225(I    )       
 1       *       ffaa::5  y    ens161.4005  ens161.4005(I    )  
                                            ens225(I    )

Build used - Latest FRR9.0 (frr_9.0-dev-master-g6c634d2-20230317.100428-1~ubuntu18.04.1_amd64.deb)
Ubuntu 18.04

R1_18feb.logs.zip
@vijaykug vijaykug added the triage Needs further investigation label Mar 18, 2023
@mobash-rasool
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Vijay tried to reproduce this issue but there is another zebra/kernel issue 13817 due to which he was unable to reproduce this issue. Hence we are not able to check further.

@SaiGomathiN
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Closing this issue as it is not reproducible because of #13817 issue.

@SaiGomathiN SaiGomathiN reopened this Aug 7, 2023
@SaiGomathiN SaiGomathiN closed this as not planned Won't fix, can't repro, duplicate, stale Aug 7, 2023
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