Hi there..
Trying to understand some Juniper MTU related issues we're having. ERX-310 router with dot1q AE connection to a pair of EX4200 switches. AE interface on the ERX-310 is showing MTU of 1522 which using my "bad MTU math" would be correct (1500+21 bytes overhead). AE interface on the EX4200 switch is showing MTU of 1514 which again using my bad math T is too low with dot1q overhead. On one of the EX4200 switches is a copper GigE connection going out to an ISP. MTU on this port is 1514. The problem is with BGP. There are two sessions towards the ISP. The first is eBGP and works fine - BGP session comes up and stays stable. The second session though is eBGP multihop (about 5-6 hops away) and tears down after 90 seconds. This is related to another message I posted recently to the list - thought we had this figured out but nope. still having an issue. All we know at this moment is the ISP is using Cisco equipment with an MTU of 1500 - pretty vague. So, with the above default MTU issues should anything really need to be adjusted considering the first session works fine? The ISP is more than happy to investigate but I wanted to understand the MTU differences on the Juniper equipment first. Thanks for any input. I hate MTU issues ;) Cheers, Paul _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
