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[EX] Protocols for IPV4 delayed when entering ingress through a backup member in EX4300

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Article ID: KB32976 KB Last Updated: 03 Apr 2021Version: 3.0
Summary:

This article explains why a delay or latency may be noticed when traffic enters ingress through a backup member of an aggregate interface in the EX4300 Series of devices.

Note: This issue is only for traffic that is destined to the Routing Engine (RE) and not applicable to transit traffic. It is applicable to IPV4 and not IPV6.

Symptoms:

Topology

When traffic enters ingress through a backup member aggregate link, latency or delay might be noticed for protocols such as Internet Control Message Protocol (ICMP) or Secure Shell (SSH).


                     ge-0/0/0(AE0)
    irb.10:          +-----------------------+
   10.10.10.2        |                       |ge-0/0/0(AE0)
+--------------------+-+                     |
|     EX4300(FPC1)MRE  |                 +---+----+
+----------------------+                 | EX4200 +----------> Host
|     EX4300(FPC0)BRE  |                 +---+----+        (10.10.10.1)
+--------------------+-+                     |
                     |                       |ge-0/0/1(AE0)
                     +-----------------------+
                     ge-1/0/0(AE0)

root@EX4300-VC> show virtual-chassis status
 
Virtual Chassis ID: 5fb8.939a.c82f
Virtual Chassis Mode: Mixed

                                                Mstr           Mixed Route Neighbor List
Member ID  Status   Serial No    Model prio  Role      Mode  Mode ID  Interface
0 (FPC 0)  Prsnt    PE3717130104 ex4300-48t     250   Backup       VC   1  vcp-255/1/0                                                                         
1 (FPC 1)  Prsnt    PE3717130438 ex4300-48t     255   Master       VC   0  vcp-255/1/0
EX4300-VC> ping 10.10.10.1 count 10
PING 10.10.10.1 (10.10.10.1): 56 data bytes
64 bytes from 10.10.10.1: icmp_seq=0 ttl=64 time=195.077 ms
64 bytes from 10.10.10.1: icmp_seq=1 ttl=64 time=4.237 ms
64 bytes from 10.10.10.1: icmp_seq=2 ttl=64 time=11.119 ms
64 bytes from 10.10.10.1: icmp_seq=3 ttl=64 time=285.382 ms
64 bytes from 10.10.10.1: icmp_seq=4 ttl=64 time=47.039 ms
64 bytes from 10.10.10.1: icmp_seq=5 ttl=64 time=155.161 ms
64 bytes from 10.10.10.1: icmp_seq=6 ttl=64 time=11.318 ms
64 bytes from 10.10.10.1: icmp_seq=7 ttl=64 time=10.388 ms
64 bytes from 10.10.10.1: icmp_seq=8 ttl=64 time=294.514 ms
64 bytes from 10.10.10.1: icmp_seq=9 ttl=64 time=56.558 ms

--- 10.10.10.1 ping statistics ---
10 packets transmitted, 10 packets received, 0% packet loss
round-trip min/avg/max/stddev = 4.237/107.079/294.514/110.200 ms

 

Cause:

This is because the switch is configured for mixed-mode virtual-chassis, even though a same-mode virtual-chassis exists in the EX4300 Series of devices.

The aggregate link is configured on a virtual-chassis where child interfaces are present on both the primary and the backup member.

Solution:

To avoid the delay, switch from mixed mode to normal mode by using the following command:

user@switch> request virtual-chassis mode mixed disable all-members

Reboot all member switches in the virtual chassis to complete the preceding step:

user@switch> request system reboot all-members
Modification History:

2018-08-20: Corrections made to Topology in Solution section to be valid with log output
2021-03-25: Updated the article terminology to align with Juniper's Inclusion & Diversity initiatives.

 

 

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