ExtremeSwitching (EXOS)

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  • 1.  Policy Based Routing

    Posted 01-07-2014 21:58
    Create Date: Jan 11 2013 11:44AM

    Hello all,

    I'm having a strange issue with Policy Based Routing. I have two SummitStack switches, each stack is 2x x460 with standard Edge licensing throughout. There are about 5 VLANs that are common to both switches, and each VLAN has a default gateway (currently only on switch 1, but will change to VRRP). So far so good. One of the VLANs is a voice peering VLAN, and is addressed with /28. The gateway address is (anonymised) 1.1.1.65/28. On this are two SBCs, with a VIP that migrates between them of 1.1.1.68, and these have a default gateway of 1.1.1.65. All good there - these can access the Internet OK and set up voice calls to remote hosts via the net.

    Going into switch 1 is a fibre from a 3rd party, the other end of which is addressed with a static IP from our peering vlan, their address is 1.1.1.75. We need to have a SIP trunk going via this address rather than the 1.1.1.65 address, and for some reason the SBCs cannot have static routes for the SIP media. So I have put in place a policy route:

    if match all {
    source-address 1.1.1.1.68 /32 ;
    destination-address


  • 2.  RE: Policy Based Routing

    Posted 01-07-2014 21:58
    Create Date: Jan 11 2013 12:06PM

    Just a quick addendum - I have tried fixing the ARP entry statically, that had no effect. Also, I tried setting up a flow-redirect, and it too moaned about not having a next-hop:

    conf flow-redirect "nap" nexthop 1.1.1.75 ping health-check interval 5 miss 2
    Error: nexthop is not found (from Bryn_Sadler)


  • 3.  RE: Policy Based Routing

    Posted 01-07-2014 21:58
    Create Date: Jan 11 2013 12:14PM

    A further update - I've still not fixed the issue on switch 2, but I've solved my overall problem by applying the access list to the port on switch 1 that links to switch 2. Bit of a hack, but it works. Would still be interested in knowing the reason behind the behavior of switch 1, if anyone does know and can share. (from Bryn_Sadler)


  • 4.  RE: Policy Based Routing

    Posted 01-07-2014 21:58
    Create Date: Jan 14 2013 1:46PM

    Hey Sadlerb

    So I read your post and had a few questions. The default gateway is switch 1 correct? When you have switch 2 trying to do the redirect is switch 1 still active?

    Did you try this after enabling vrrp and failing the master to switch 2?

    Thanks
    P (from Paul_Russo)