The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] tag-switching and MTU on c7206
Hi all, Does anyone have the follwing problem with tag-swiching. I couldn't find anything related in mail archieve. I started tag-swiching between two cisco 7206 VXR (IOS 12.1(6)E and 12.1(5)E JS). The routers are connected to each other with FE interfaces via 3Com and cisco switches. It seems that there is problem with MTU path discovery if traffic goes between these two routers and tag-witching is enabled on FE interfaces. Some web servers are inaccessible e.g. mail.yahoo.com. Ping and traceroutes are ok, but http with large pages doesnt work. When I stop tag-switching on FE interfaces everything is working fine. I know that LDP (TDP) calculates minimum MTU over the LSP and if packet is lager, it is fragmented before entering MPLS domain. So I shoudn't care about actual MTU on interfaces in MPLS core and labels size. Do you know if it is a IOS bug, or I have to configure differen MTU, when take into account interfaces MTU and label stack? And one more thing: when I change tag-switching mtu on FE interfaces to 1540 this problem seems disappear, but I really don't think it is correct to manualy set MTU on LSP. Thanks, Venko Moyankov ------- The MPLS-OPS Mailing List Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml Archive: http://www.mplsrc.com/mpls-ops_archive.shtml
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