On 13/Oct/15 04:56, Chad Levy wrote:
> Hi all, > > I am having an issue with a new set of Juniper MX80 routers and an EX4500 > switch. My topology is extremely simple, each MX80 has its own internet > provider running full BGP routes, and iBGP between the two. The EX4500 is > connected to both MX80 devices with /30 P2P running OSPF with route > redistribution. The MX80s are originating a default route to the EX4500 via > OSPF. > > I have a single /24 announced to both of my internet providers with a machine > connected to the EX4500 via a /30. > > Both MX80 devices can ping the machine, and vice-versa. My issue becomes when > I have an inbound route traverse "ISP A" on one MX, but the return path tries > to egress "ISP B" on the other MX. Traffic is dropped and never reaches its > final destination. The same behavior happens when the ingress is on "ISP B" > and egress on "ISP A". > > If the ingress and egress paths are symmetrical, connectivity is fine. > Additionally, if I override the OSPF learned route for the machines /30 on > the ingress MX80, and point a static route to the egress path MX80 for the > /30, traffic flows perfectly fine. > > I do not have any elaborate firewall filters or anything such as RPF enabled, > etc on any of the devices at this time. My carriers are also not filtering > any traffic on their side. > > Are there any default configurations in place on either the MX80 or EX4500 > that could cause this behavior? One MX80 is running JunOS 13.3, the second MX > and the EX4500 are both running JunOS 12.3. The behavior is similar to using > a pair of SRX devices in flow mode with traffic ingress on one device, and > egress on another. What is the PC's default gateway? The MX80's or the EX4500? Mark. _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
