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Enabling nonstop active routing (NSR) on an EX Series switch will not disable the default graceful-restart (GR) helper mode

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Article ID: KB27612 KB Last Updated: 04 Mar 2017Version: 2.0
Summary:
EX Series switch with NSR enabled, will not disable the default graceful-restart (GR) helper mode. The same has been tested and proved in the following section.
Symptoms:

Cause:

Solution:
JTAC Lab Test Results
--------------------------------

Topology

EX4200-VC [AE0]======= TRUNK (LACP) ======== [AE0] EX8200-VC
  • ae0 on EX4200VC is made up of ge-0/0/0 and ge-1/0/0
  • NSR is enabled on EX8200VC
  • GR is enabled on EX4200VC for OSPFv2 and OSPFv3
  • Vlan - V100 is configured for layer-3 on EX4200VC and EX8200VC
  • On EX4200VC, V100 - 10.0.0.2 , 2000::2, Lo0 - 1.1.1.1 , 1111::1
  • On Ex8200VC, V100 - 10.0.0.1 , 2000::1
  • OSPFv2 and OSPFv3 is running on vlan100

1) Failover scenario on the EX4200 VC: Mastership Failover on the EX4200-VC, does not withdraw OSPF route from the EX8200 VC(Running Junos 11.4R5.5)

2) Restarting routing on the EX4200VC brings OSPF neighborship down but it does not withdraw OSPF route from the EX8200 VC. This behavior has been confirmed for OSPFv2 and OSPFv3.

- Restated routing on the EX4200VC with a continuous ping to the lo0 interface, OSPF neighborship goes down but it does not withdraw OSPF route.
- No ping loss was observed on the switch

Replication: (OSPFv2)

---------------------
On EX4200 VC
---------------------

{master:0}[edit]
root@EX4200# run show lldp neighbors
Local Interface Parent Interface Chassis Id Port info System Name
me0.0 - 00:19:e2:52:e3:00 ge-0/0/25.0 PTAC_EX_CORE
ge-0/0/0.0 ae0.0 00:23:9c:4f:88:00 ge-16/0/0.0
ge-0/0/1.0 ae0.0 00:23:9c:4f:88:00 ge-3/0/1.0

{master:0}[edit]
root@EX4200# run show vlans brief
Ports
Name Tag Primary Address Active/Total
V100 100 10.0.0.2/24 1/1
default 0/22


{master:0}[edit]
root@EX4200# show interfaces ae0
aggregated-ether-options {
lacp {
active;
}
}
unit 0 {
family ethernet-switching {
port-mode trunk;
vlan {
members 100;
}
}
}

{master:0}[edit]
root@EX4200# show chassis
aggregated-devices {
ethernet {
device-count 1;
}
}

{master:0}[edit]
root@EX4200# show routing-options
graceful-restart; <------------ GR Enabled
static {
route 0.0.0.0/0 next-hop 10.9.221.100;
}

{master:0}[edit]
root@EX4200# show protocols ospf
export STATIC->OSPF; <------------ POLICY EXPORTED IN OSPF
area 0.0.0.0 {
interface vlan.100;
}

{master:0}[edit]
root@EX4200# show policy-options
policy-statement STATIC->OSPF {
term T1 {
from {
protocol direct;
route-filter 1.1.1.1/32 exact; <------------ Lo0 REDISTRIBUTED INTO OSPF
}
then accept;
}
term T2 {
then reject;
}
}

{master:0}[edit]
root@EX4200# run show ospf neighbor
Address Interface State ID Pri Dead
10.0.0.1 vlan.100 Full 10.0.0.1 128 38

{master:0}[edit]
root@EX4200# run show ospf overview
Instance: master
Router ID: 1.1.1.1
Route table index: 0
AS boundary router
LSA refresh time: 50 minutes
Restart: Enabled
Restart duration: 180 sec <------------
Restart grace period: 210 sec <------------
Helper mode: Enabled
Area: 0.0.0.0
Stub type: Not Stub
Authentication Type: None
Area border routers: 0, AS boundary routers: 0
Neighbors
Up (in full state): 1
Topology: default (ID 0)
Prefix export count: 1
Full SPF runs: 6
SPF delay: 0.200000 sec, SPF holddown: 5 sec, SPF rapid runs: 3
Backup SPF: Not Needed

{master:0}[edit]
root@EX4200# run restart routing
Routing protocols process started, pid 13838 <------------ ROUTING RESTARTED

--------------------
On Ex8200 VC
-------------------

{master:9}[edit]
root# run show virtual-chassis

Virtual Chassis ID: ff39.e1ae.0f68
Virtual Chassis Mode: Enabled
Mastership Neighbor List
Member ID Status Serial No Model priority Role ID Interface
0 (FPC 0-15) Prsnt BT0909120542 ex8208 0 Linecard 9 vcp-0/0
1 (FPC 16-31) Prsnt BA0909250244 ex8216 0 Linecard 9 vcp-0/0
9 (FPC 144-159) Prsnt 022010000006 ex-xre 128 Master* 0 vcp-1/2
1 vcp-1/3

{master:9}[edit]
root# run show vlans brief
Ports
Name Tag Primary Address Active/Total
V100 100 10.0.0.1/24 1/1
default


Member ID for next new member: 2

{master:9}[edit]
root# run show lldp neighbors
Local Interface Parent Interface Chassis Id Port info System Name
ge-16/0/0.0 ae0.0 2c:6b:f5:8b:23:00 ge-0/0/0.0 EX4200
ge-3/0/1.0 ae0.0 2c:6b:f5:8b:23:00 ge-0/0/1.0 EX4200

{master:9}[edit]
root# show interfaces ae0
aggregated-ether-options {
lacp {
active;
}
}
unit 0 {
family ethernet-switching {
port-mode trunk;
vlan {
members all;
}
}
}

{master:9}[edit]
root# show routing-options
nonstop-routing; <------------ NSR ENABLED
static {
route 0.0.0.0/0 next-hop 10.9.221.100;
}

{master:9}[edit]
root# show chassis
redundancy {
graceful-switchover;
}
aggregated-devices {
ethernet {
device-count 1;
}
}

{master:9}[edit]
root# show system commit
synchronize;

{master:9}[edit]
root# show protocols ospf
area 0.0.0.0 {
interface vlan.100; <------------
}

root# run show ospf neighbor
Address Interface State ID Pri Dead
10.0.0.2 vlan.100 Full 1.1.1.1 128 38

{master:9}[edit]
root# run show ospf overview
Instance: master
Router ID: 10.0.0.1
Route table index: 0
LSA refresh time: 50 minutes
Area: 0.0.0.0
Stub type: Not Stub
Authentication Type: None
Area border routers: 0, AS boundary routers: 1
Neighbors
Up (in full state): 1
Topology: default (ID 0)
Prefix export count: 0
Full SPF runs: 8
SPF delay: 0.200000 sec, SPF holddown: 5 sec, SPF rapid runs: 3
Backup SPF: Not Needed

{master:9}[edit]
root# run show route

inet.0: 8 destinations, 8 routes (8 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

0.0.0.0/0 *[Static/5] 03:59:58
> to 10.9.221.100 via me0.0
1.1.1.1/32 *[OSPF/150] 03:45:02, metric 0, tag 0 <------------
> to 10.0.0.2 via vlan.100
10.0.0.0/24 *[Direct/0] 03:45:42
> via vlan.100
10.0.0.1/32 *[Local/0] 03:58:12
Local via vlan.100
10.9.221.0/24 *[Direct/0] 03:59:58
> via me0.0
10.9.221.199/32 *[Local/0] 03:59:58
Local via me0.0
224.0.0.5/32 *[OSPF/10] 03:59:59, metric 1
MultiRecv
224.0.0.22/32 *[IGMP/0] 03:59:59
MultiRecv

{master:9}[edit]
root# run ping 1.1.1.1 rapid count 1000 <------------ NO PING LOSS OBSERVED WHEN ROUTING WAS RESTARTED ON EX4200
PING 1.1.1.1 (1.1.1.1): 56 data bytes
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
--- 1.1.1.1 ping statistics ---
1000 packets transmitted, 1000 packets received, 0% packet loss
round-trip min/avg/max/stddev = 2.078/4.914/50.812/2.601 ms

{master:9}[edit]
root# run show ospf neighbor <------------ NO PING LOSS OBSERVED WHEN ROUTING WAS RESTARTED ON EX4200
Address Interface State ID Pri Dead
10.0.0.2 vlan.100 ExStart 1.1.1.1 128 38


{master:9}[edit]
root# run ping 1.1.1.1 rapid count 1000 <------------ NO PING LOSS OBSERVED WHEN ROUTING WAS RESTARTED ON EX4200
PING 1.1.1.1 (1.1.1.1): 56 data bytes
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
--- 1.1.1.1 ping statistics ---
1000 packets transmitted, 1000 packets received, 0% packet loss
round-trip min/avg/max/stddev = 2.065/4.766/19.275/2.172 ms

{master:9}[edit]
root# run show ospf neighbor
Address Interface State ID Pri Dead
10.0.0.2 vlan.100 ExStart 1.1.1.1 128 38

{master:9}[edit]
root# run show route 1.1.1.1

inet.0: 8 destinations, 8 routes (8 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

1.1.1.1/32 *[OSPF/150] 03:47:17, metric 0, tag 0
> to 10.0.0.2 via vlan.100

------------------Replication: (OSPFv2 & OSPFv3)------------------

-------------
On EX4200 Vc
-------------

{master:0}[edit]
root@EX4200# run show lldp neighbors
Local Interface Parent Interface Chassis Id Port info System Name
me0.0 - 00:19:e2:52:e3:00 ge-0/0/25.0 PTAC_EX_CORE
ge-0/0/0.0 ae0.0 00:23:9c:4f:88:00 ge-16/0/0.0
ge-0/0/1.0 ae0.0 00:23:9c:4f:88:00 ge-3/0/1.0

{master:0}[edit]
root@EX4200# run show vlans brief
Ports
Name Tag Primary Address Active/Total
V100 100 10.0.0.2/24 1/1
2000::2/64
Ports
Name Tag Primary Address Active/Total
default 0/22

{master:0}[edit]
root@EX4200# show routing-options
graceful-restart; <------------GR is enabled
static {
route 0.0.0.0/0 next-hop 10.9.221.100;
}

{master:0}[edit]
root@EX4200# show chassis
aggregated-devices {
ethernet {
device-count 1;
}
}

{master:0}[edit]
root@EX4200# show interfaces ae0
aggregated-ether-options {
lacp {
active;
}
}
unit 0 {
family ethernet-switching {
port-mode trunk;
vlan {
members 100;
}
}
}

{master:0}[edit]
root@EX4200# show protocols ospf
export STATIC->OSPF; <------------
area 0.0.0.0 {
interface vlan.100;
}

{master:0}[edit]
root@EX4200# show protocols ospf3
export DIRECTv6->OSPF; <------------
area 0.0.0.0 {
interface vlan.100;
}

{master:0}[edit]
root@EX4200# show policy-options
policy-statement DIRECTv6->OSPF {
term T1 {
from {
protocol direct;
route-filter 1111::1/128 exact; <------------ Lo0 REDISTRIBUTED INTO OSPF
}
then accept;
}
term T2 {
then reject;
}
}
policy-statement STATIC->OSPF {
term T1 {
from {
protocol direct;
route-filter 1.1.1.1/32 exact; <------------ Lo0 REDISTRIBUTED INTO OSPF
}
then accept;
}
term T2 {
then reject;
}
}

{master:0}[edit]
root@EX4200# run show ospf neighbor
Address Interface State ID Pri Dead
10.0.0.1 vlan.100 Full 10.0.0.1 128 36

{master:0}[edit]
root@EX4200# run show ospf3 neighbor
ID Interface State Pri Dead
10.0.0.1 vlan.100 Full 128 36
Neighbor-address fe80::223:9cff:fe4f:8801

{master:0}[edit]
root@EX4200# run show ospf overview
Instance: master
Router ID: 1.1.1.1
Route table index: 0
AS boundary router
LSA refresh time: 50 minutes
Restart: Enabled
Restart duration: 180 sec <------------
Restart grace period: 210 sec <------------
Helper mode: Enabled
Area: 0.0.0.0
Stub type: Not Stub
Authentication Type: None
Area border routers: 0, AS boundary routers: 0
Neighbors
Up (in full state): 1
Topology: default (ID 0)
Prefix export count: 1
Full SPF runs: 4
SPF delay: 0.200000 sec, SPF holddown: 5 sec, SPF rapid runs: 3
Backup SPF: Not Needed

{master:0}[edit]
root@EX4200# run show ospf3 overview
Instance: master
Router ID: 1.1.1.1
Route table index: 0
AS boundary router
LSA refresh time: 50 minutes
Restart: Enabled
Restart duration: 180 sec <------------
Restart grace period: 210 sec <------------
Helper mode: Enabled
Area: 0.0.0.0
Stub type: Not Stub
Area border routers: 0, AS boundary routers: 0
Neighbors
Up (in full state): 1
Topology: default (ID 0)
Prefix export count: 1
Full SPF runs: 3
SPF delay: 0.200000 sec, SPF holddown: 5 sec, SPF rapid runs: 3
Backup SPF: Not Needed

{master:0}[edit]
root@EX4200# run restart routing
Routing protocols process started, pid 14046 <------------ ROUTING RESTARTED

-------------
On Ex8200 VC
-------------

{master:9}[edit]
root# run show lldp neighbors
Local Interface Parent Interface Chassis Id Port info System Name
ge-16/0/0.0 ae0.0 2c:6b:f5:8b:23:00 ge-0/0/0.0 EX4200
ge-3/0/1.0 ae0.0 2c:6b:f5:8b:23:00 ge-0/0/1.0 EX4200

{master:9}[edit]
root# run show vlans brief
Ports
Name Tag Primary Address Active/Total
V100 100 10.0.0.1/24 1/1
2000::1/64
Ports
Name Tag Primary Address Active/Total
default

{master:9}[edit]
root# show system commit
synchronize;

{master:9}[edit]
root# show protocols ospf
area 0.0.0.0 {
interface vlan.100;
}

{master:9}[edit]
root# show protocols ospf3
area 0.0.0.0 {
interface vlan.100;
}

{master:9}[edit]
root# show chassis
redundancy {
graceful-switchover;
}
aggregated-devices {
ethernet {
device-count 1;
}
}

{master:9}[edit]
root# show routing-options
nonstop-routing; <------------ NSR ENABLED
static {
route 0.0.0.0/0 next-hop 10.9.221.100;
}

{master:9}[edit]
root# run show ospf overview
Instance: master
Router ID: 10.0.0.1
Route table index: 0
LSA refresh time: 50 minutes
Area: 0.0.0.0
Stub type: Not Stub
Authentication Type: None
Area border routers: 0, AS boundary routers: 1
Neighbors
Up (in full state): 1
Topology: default (ID 0)
Prefix export count: 0
Full SPF runs: 9
SPF delay: 0.200000 sec, SPF holddown: 5 sec, SPF rapid runs: 3
Backup SPF: Not Needed

{master:9}[edit]
root# run show ospf3 overview
Instance: master
Router ID: 10.0.0.1
Route table index: 0
LSA refresh time: 50 minutes
Area: 0.0.0.0
Stub type: Not Stub
Area border routers: 0, AS boundary routers: 1
Neighbors
Up (in full state): 1
Topology: default (ID 0)
Prefix export count: 0
Full SPF runs: 5
SPF delay: 0.200000 sec, SPF holddown: 5 sec, SPF rapid runs: 3
Backup SPF: Not Needed

{master:9}[edit]
root# run show ospf neighbor
Address Interface State ID Pri Dead
10.0.0.2 vlan.100 Full 1.1.1.1 128 33

{master:9}[edit]
root# run show ospf3 neighbor
ID Interface State Pri Dead
1.1.1.1 vlan.100 Full 128 35
Neighbor-address fe80::2e6b:f5ff:fe8b:2300

{master:9}[edit]
root# run show route | no-more

inet.0: 8 destinations, 8 routes (8 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

0.0.0.0/0 *[Static/5] 04:28:36
> to 10.9.221.100 via me0.0
1.1.1.1/32 *[OSPF/150] 04:13:40, metric 0, tag 0
> to 10.0.0.2 via vlan.100
10.0.0.0/24 *[Direct/0] 04:14:20
> via vlan.100
10.0.0.1/32 *[Local/0] 04:26:50
Local via vlan.100
10.9.221.0/24 *[Direct/0] 04:28:36
> via me0.0
10.9.221.199/32 *[Local/0] 04:28:36
Local via me0.0
224.0.0.5/32 *[OSPF/10] 04:28:37, metric 1
MultiRecv
224.0.0.22/32 *[IGMP/0] 04:28:37
MultiRecv

inet6.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

1111::1/128 *[OSPF3/150] 00:10:25, metric 0, tag 0
> to fe80::2e6b:f5ff:fe8b:2300 via vlan.100
2000::/64 *[Direct/0] 00:19:06
> via vlan.100
2000::1/128 *[Local/0] 00:19:06
Local via vlan.100
fe80::/64 *[Direct/0] 00:19:06
> via vlan.100
fe80::223:9cff:fe4f:8801/128
*[Local/0] 00:19:06
Local via vlan.100
ff02::5/128 *[OSPF3/10] 00:19:06, metric 1
MultiRecv


{master:9}[edit]
root# run show ospf neighbor
Address Interface State ID Pri Dead
10.0.0.2 vlan.100 ExStart 1.1.1.1 128 35 <------------ NO PING LOSS OBSERVED WHEN ROUTING WAS RESTARTED ON EX4200

{master:9}[edit]
root# run show ospf3 neighbor
ID Interface State Pri Dead
1.1.1.1 vlan.100 ExStart 128 33 <------------ NO PING LOSS OBSERVED WHEN ROUTING WAS RESTARTED ON EX4200
Neighbor-address fe80::2e6b:f5ff:fe8b:2300

{master:9}[edit]
root# run ping 1.1.1.1 <------------ NO PING LOSS OBSERVED WHEN ROUTING WAS RESTARTED ON EX4200
PING 1.1.1.1 (1.1.1.1): 56 data bytes
64 bytes from 1.1.1.1: icmp_seq=0 ttl=64 time=3.122 ms
64 bytes from 1.1.1.1: icmp_seq=1 ttl=64 time=9.727 ms
64 bytes from 1.1.1.1: icmp_seq=2 ttl=64 time=2.862 ms
64 bytes from 1.1.1.1: icmp_seq=3 ttl=64 time=5.712 ms
^C
--- 1.1.1.1 ping statistics ---
22 packets transmitted, 22 packets received, 0% packet loss
round-trip min/avg/max/stddev = 2.753/6.674/16.570/3.428 ms

{master:9}[edit]
root# run ping 1111::1 <------------ NO PING LOSS OBSERVED WHEN ROUTING WAS RESTARTED ON EX4200
PING6(56=40+8+8 bytes) 2000::1 --> 1111::1
16 bytes from 1111::1, icmp_seq=0 hlim=64 time=2.967 ms
16 bytes from 1111::1, icmp_seq=1 hlim=64 time=2.672 ms
16 bytes from 1111::1, icmp_seq=2 hlim=64 time=5.182 ms
16 bytes from 1111::1, icmp_seq=3 hlim=64 time=4.422 ms
^C
--- 1111::1 ping6 statistics ---
23 packets transmitted, 23 packets received, 0% packet loss
round-trip min/avg/max/std-dev = 2.672/4.454/8.061/1.539 ms
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