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Not able to generate ARP Request from SRX High End



Article ID: KB24343 KB Last Updated: 27 Jun 2012Version: 1.0
 This article describes a condition where SRX High End is unable to generate ARP Request
 SRX High End is unable to generate ARP Request
Steps to Resolve this Problem: 1. "show route" shows that there's only ONE Route i.e. Directly connected:
root@srx3600-cluster> show route    
inet.0: 11 destinations, 12 routes (11 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both *[Direct/0] 05:28:52
> via reth0.1125
2. reth0.1125 is the interface that is directly connected to the network
root@srx3600-cluster> show interfaces terse | match reth0.1125
xe-1/0/1.1125 up up aenet --> reth0.1125
xe-14/0/1.1125 up up aenet --> reth0.1125
reth0.1125 up up inet
3. FXP interface had the same ip address but it is currently DOWN, so we assume it is NOT important:
root@srx3600-cluster> show interfaces terse | match fxp
fxp0 up up
fxp0.0 up down inet
4. But look here, in the Forwarding Table, we found two Routes to the same destination. One through FXP and the other through reth0.1125:
root@srx3600-cluster> show route forwarding-table destination
Routing table: default.inet
Destination Type RtRef Next hop Type Index NhRef Netif intf 0 rslv 332 1 fxp0.0       intf     0                    rslv   517     1 reth0.1125

SRX prefers the route through the FXP interface even though it is down, and that's why we don't see the ARP generated from the reth0.1125 interface.

Note: FXP Interface is always going to be prefered over Data Plane Revenue port if a packet is originated from the SRX.

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