Routing

Hello *,

anyone experiencing high round-trip times when configuring basic L2 local bridging + RVI on EX4600 (13.2X51-D30.4)?

I use recommended ELS syntax for configuring vlan tagged ports and assigning IRB to vlans.

L2 interface:
set interfaces ge-0/0/1 description ANY-SERVER
set interfaces ge-0/0/1 unit 0 family ethernet-switching interface-mode access
set interfaces ge-0/0/1 unit 0 family ethernet-switching vlan members SOME-VLAN
set interfaces ge-0/0/1 unit 0 family ethernet-switching storm-control default

VLan and IRB:
set interfaces irb unit 1234 family inet address XXX.XXX.XXX.XXX/XX
set interfaces irb unit 1234 family inet6 address YYYY::/YY
set vlans SOME-VLAN vlan-id 1234
set vlans SOME-VLAN l3-interface irb.1234

Pinging (ICMP echo) those IRBs on EX4600 through direct connected access/trunk ports within same vlan (bridge domain)  results in avarage roud-trip of 14-20ms. (CPU is idle, media does not matter- same on 1Gb copper as 10Gb optic)

Normally non-ELS EX4500/4550 using RVI in form interface vlan have round-trip below 1ms.

Anyone experienced similar behavior?


I came around this KB https://kb.juniper.net/InfoCenter/index?page=content&id=KB27335 but 20ms is much higher as those round-trips on lower EX family

Hi,

The article you have pasted says that it can be higher due to cpu usage. Have you tried to do icmp from host A connected to the devices to an host b on the otherside of the device ? What is the latency then.

The article also states that

IRBs are working as expected and also E2E round-trips are fine.

I just wondered that although ICMP echos exception traffic is handled by RE, i got 4 to 5 times the round-trip average on and IDLE EX4600 as compared to an idle EX4550-  OK, EX4600 is i386 and EX4550 is powerpc but in nearly complete idle a delta of times 4-5 comparing EX4600 and EX4550?!

I dont use vlan L3-interfaces as performance indication- i just was surprised.

I experienced that also on MX80- but OK, the EX4600 (ELS) is closer to those MX as to the original EX family.

EX4600 is closer to QFX5100 than to MX/other EX.

The latency is because Junos runs in a VM.

Check this PR:

https://prsearch.juniper.net/InfoCenter/index?page=prcontent&id=PR966905

There are some improvements in 14.11X53-D25 and later releases.

=====

If this worked for you please flag my post as an "Accepted Solution" so others can benefit. A kudo would be cool if you think I earned it.

updating to version suggested will have to wait until maintenace window- but lets see if rt`s change then

Good evening everyone

well version JUNOS Base OS Software Suite [14.1X53-D40.8] same problem

irb round trip nighmare

EX3300 directly conneted to a virtual chassis EX4600 with lacp link, pinging default gateway (EX4600 irb)

EX3300>
PING 172.17.169.225 (172.17.169.225): 56 data bytes
64 bytes from 172.17.169.225: icmp_seq=0 ttl=64 time=30.237 ms
64 bytes from 172.17.169.225: icmp_seq=1 ttl=64 time=19.656 ms
64 bytes from 172.17.169.225: icmp_seq=2 ttl=64 time=31.374 ms
64 bytes from 172.17.169.225: icmp_seq=3 ttl=64 time=14.048 ms
64 bytes from 172.17.169.225: icmp_seq=4 ttl=64 time=23.723 ms
64 bytes from 172.17.169.225: icmp_seq=5 ttl=64 time=11.387 ms
64 bytes from 172.17.169.225: icmp_seq=6 ttl=64 time=30.875 ms
64 bytes from 172.17.169.225: icmp_seq=7 ttl=64 time=16.032 ms
64 bytes from 172.17.169.225: icmp_seq=8 ttl=64 time=15.145 ms
64 bytes from 172.17.169.225: icmp_seq=9 ttl=64 time=24.664 ms
^C
--- 172.17.169.225 ping statistics ---
10 packets transmitted, 10 packets received, 0% packet loss
round-trip min/avg/max/stddev = 11.387/21.714/31.374/7.125 ms

and routing engine is doing nothing

EX4600> show chassis routing-engine
Routing Engine status:
  Slot 0:
    Current state                  Backup
    Temperature                 41 degrees C / 105 degrees F
    CPU temperature             41 degrees C / 105 degrees F
    DRAM                      1953 MB
    Memory utilization          40 percent
    CPU utilization:
      User                       6 percent
      Background                 0 percent
      Kernel                     3 percent
      Interrupt                  0 percent
      Idle                      91 percent
    Model                          EX4600-40F
    Serial ID                      BUILTIN
    Uptime                         16 days, 2 hours, 55 minutes, 35 seconds
    Last reboot reason             0x2000:hypervisor reboot
    Load averages:                 1 minute   5 minute  15 minute
                                       0.08       0.11       0.08
Routing Engine status:
  Slot 1:
    Current state                  Master
    Temperature                 36 degrees C / 96 degrees F
    CPU temperature             36 degrees C / 96 degrees F
    DRAM                      1953 MB
    Memory utilization          47 percent
    CPU utilization:
      User                       6 percent
      Background                 0 percent
      Kernel                     3 percent
      Interrupt                  1 percent
      Idle                      90 percent
    Model                          EX4600-40F
    Serial ID                      BUILTIN
    Uptime                         22 days, 3 hours, 16 minutes, 34 seconds
    Last reboot reason             0x1:power cycle/failure
    Load averages:                 1 minute   5 minute  15 minute
                                       0.13       0.15       0.13