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Raj_Khatri
Copper

Static ECMP

We are trying to do ECMP with static routing and have configured 2 default routes. The "show route" command shows two default next hops, however, "netstat -r" shows only one default next hop.  We currently use 2 next hops and the ping feature to determine next hop status which seems to work well.  Does anyone know if this is achievable to load balance using statics for default route?  I know this can be done using eBGP...

Sample CLI output -

#show route
S 0.0.0.0/0 via 1.1.1.1, eth3-01, cost 0, age 767583 
                  via 1.1.1.2, eth3-01

#netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
default 1.1.1.1 0.0.0.0 UGD 0 0 0 eth3-01

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5 Replies
Admin
Admin

Re: Static ECMP

Yes, this is supported, but you need to configure the maximum number of path splits in Gaia.

Configuring Equal Cost Path Splitting - Gaia Portal

  1. In the tree view, click Advanced Routing > Routing Options.
  2. In the Equal Cost Multipath section, select the Maximum Paths.
  3. Click Apply.
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Raj_Khatri
Copper

Re: Static ECMP

Changed from default setting of 8 down to 2 and still shows the same in 'netstat -r | grep default'

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Admin
Admin

Re: Static ECMP

It's possible what you're seeing is expected.

Sundeep Mudgal‌, any thoughts?

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Employee
Employee

Re: Static ECMP

netstat might have a bug. Please try "ip r' command in expert mode.

Raj_Khatri
Copper

Re: Static ECMP

Sundeep, I do see both static default routes when running "ip r"   So it does seem like a bug with "netstat -r" output.  We have an open case with TAC who is also checking with R&D.  Thanks again.

fw> show route static

S         0.0.0.0/0           via x.x.x.230, eth3-01, cost 0, age 514897
                                     via x.x.x.231, eth3-01

[Expert@fw:0]# netstat -r | grep default
default         x.x.x.230  0.0.0.0         UGD       0 0          0 eth3-01

[Expert@fw-:0]# ip r
default  proto routed
        nexthop via x.x.x.230  dev eth3-01 weight 1
        nexthop via x.x.x.231  dev eth3-01 weight 1

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