To add another default gateway to a dedicated interface, in this example I want 2 interfaces and one default GW for each IP (my 2nd interface has IP 10.10.10.10)
ip route add default via 10.10.10.1 table 100 ip rule add from 10.10.10.10 table 100 ip rule list ip route list table local ip route list table 100
source & more : http://lartc.org/howto/lartc.rpdb.html
Cisco Catalyst switches use CAM and TCAM to store MAC addresses, ACL, QoS tables in order to have wire-speed switching : they are ASICs and search the entire memory in one operation.
The CAM (Content Addressable Memory) stores MAC addresses, VLAN and ports assignments. During a lookup, the CAM returns the address where the data is stored (the inverse of regular RAM). It is used on L2 swich.
The TCAM (Ternary Content Addressable Memory) is used on L3 switch to store the routing table (it is also used to store ACL and QoS information). During the lookup, keys are network and mask and result can be next-hop or action (permit or deny) for ACL.
Very well explained and detailed post : https://supportforums.cisco.com/document/60831/cam-vs-tcam
To see CAM and CAM usage (Theses commands were used on a 3750):
show mac address-table dynamic show mac address-table count
To see TCAM usage :
show platform tcam utilization
To see routes that could'nt be inserted into TCAM :
show platform ip unicast counts
To view the number of route entries for each protocol :
show ip route summary
If you find a high number of prefixes not in TCAM, and a high TCAM usage, you should considering changing the SDM (switch database management) template.
To see the currently used SDM :
show sdm prefer
To see anoter SDM template :
show sdm prefer dual-ipv4-and-ipv6 routing
show processes cpu history
CEF (Cisco Express Forwarding) is a forwarding model in which all routing information is put into the FIB (forwarding information base). The FIB is used to store IP routing information (prefixes and next-hop), in addition to the FIB, CEF uses adjacency tables to store Layer 2 addressing information.
Source : http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/... and http://www.ciscopress.com/articles/article.asp?p=425816&seqNum=2
do not trust distance, you should make your math (adding attenuation of your links/connectors): 10dB 2/10km LR 13dB 15km 16/24dB 40km ER 26/28dB 80km ZR 32db 120km 37dB 160km Channel Lamda (nm) Freq (Thz) 72 (DWDM Channel C72) 1520,25 197,20 71 (DWDM Channel C71) 1521,02 197,10 70 (DWDM Channel C70) 1521,79 197,00 69 (DWDM Channel C69) 1522,56 196,90 68 (DWDM Channel C68) 1523,34 196,80 67 (DWDM Channel C67) 1524,11 196,70 66 (DWDM Channel C66) 1524,89 196,60 65 (DWDM Channel C65) 1525,66 196,50 64 (DWDM Channel C64) 1526,44 196,40 63 (DWDM Channel C63) 1527,22 196,30 62 (DWDM Channel C62) 1527,99 196,20 61 (DWDM Channel C61) 1528,77 196,10 60 (DWDM Channel C60) 1529,55 196,00 59 (DWDM Channel C59) 1530,33 195,90 58 (DWDM Channel C58) 1531,12 195,80 57 (DWDM Channel C57) 1531,90 195,70 56 (DWDM Channel C56) 1532,68 195,60 55 (DWDM Channel C55) 1533,47 195,50 54 (DWDM Channel C54) 1534,25 195,40 53 (DWDM Channel C53) 1535,04 195,30 52 (DWDM Channel C52) 1535,82 195,20 51 (DWDM Channel C51) 1536,61 195,10 50 (DWDM Channel C50) 1537,4 195,00 49 (DWDM Channel C49) 1538,19 194,90 48 (DWDM Channel C48) 1538,98 194,80 47 (DWDM Channel C47) 1539,77 194,70 46 (DWDM Channel C46) 1540,56 194,60 45 (DWDM Channel C45) 1541,35 194,50 44 (DWDM Channel C44) 1542,14 194,40 43 (DWDM Channel C43) 1542,94 194,30 42 (DWDM Channel C42) 1543,73 194,20 41 (DWDM Channel C41) 1544,53 194,10 40 (DWDM Channel C40) 1545,32 194,00 39 (DWDM Channel C39) 1546,12 193,90 38 (DWDM Channel C38) 1546,92 193,80 37 (DWDM Channel C37) 1547,72 193,70 36 (DWDM Channel C36) 1548,51 193,60 35 (DWDM Channel C35) 1549,32 193,50 34 (DWDM Channel C34) 1550,12 193,40 33 (DWDM Channel C33) 1550,92 193,30 32 (DWDM Channel C32) 1551,72 193,20 31 (DWDM Channel C31) 1552,52 193,10 30 (DWDM Channel C30) 1553,33 193,00 29 (DWDM Channel C29) 1554,13 192,90 28 (DWDM Channel C28) 1554,94 192,80 27 (DWDM Channel C27) 1555,75 192,70 26 (DWDM Channel C26) 1556,55 192,60 25 (DWDM Channel C25) 1557,36 192,50 24 (DWDM Channel C24) 1558,17 192,40 23 (DWDM Channel C23) 1558,98 192,30 22 (DWDM Channel C22) 1559,79 192,20 21 (DWDM Channel C21) 1560,61 192,10 20 (DWDM Channel C20) 1561,42 192,00 19 (DWDM Channel C19) 1562,23 191,90 18 (DWDM Channel C18) 1563,05 191,80 17 (DWDM Channel C17) 1563,86 191,70 16 (DWDM Channel C16) 1564,68 191,60 15 (DWDM Channel C15) 1565,50 191,50 14 (DWDM Channel C14) 1566,31 191,40 13 (DWDM Channel C13) 1567,13 191,30 12 (DWDM Channel C12) 1567,95 191,20 11 (DWDM Channel C11) 1568,67 191,10 10 (DWDM Channel C10) 1569,59 191,00 9 (DWDM Channel C09) 1570,42 190,90 8 (DWDM Channel C08) 1571,24 190,80 7 (DWDM Channel C07) 1572,06 190,70 6 (DWDM Channel C06) 1572,89 190,60 5 (DWDM Channel C05) 1573,71 190,50 4 (DWDM Channel C04) 1574,54 190,40 3 (DWDM Channel C03) 1575,37 190,30 2 (DWDM Channel C02) 1576,20 190,20 1 (DWDM Channel C01) 1577,03 190,10